MRK Merck and Co Inc

FALSE2022Q2000031015812/310.1000000003101582022-01-012022-06-300000310158us-gaap:CommonStockMember2022-01-012022-06-300000310158mrk:A0.500Notesdue2024Member2022-01-012022-06-300000310158mrk:A1.875Notesdue2026Member2022-01-012022-06-300000310158mrk:A2.500Notesdue2034Member2022-01-012022-06-300000310158mrk:A1.375Notesdue2036Member2022-01-012022-06-3000003101582022-07-31xbrli:shares00003101582022-04-012022-06-30iso4217:USD00003101582021-04-012021-06-3000003101582021-01-012021-06-30iso4217:USDxbrli:shares00003101582022-06-3000003101582021-12-3100003101582020-12-3100003101582021-06-300000310158us-gaap:InterestRateSwapMember2022-06-30mrk:interest_rate_swap0000310158mrk:OrganonCoMember2021-06-0200003101582021-06-020000310158mrk:TransitionServicesAgreementMembersrt:MinimumMember2021-06-022021-06-020000310158srt:MaximumMembermrk:TransitionServicesAgreementMember2021-06-022021-06-020000310158mrk:ManufacturingAndSupplyAgreementsMembersrt:MinimumMember2021-06-022021-06-020000310158srt:MaximumMembermrk:ManufacturingAndSupplyAgreementsMember2021-06-022021-06-020000310158mrk:OrganonCoMember2022-04-012022-06-300000310158mrk:OrganonCoMember2022-01-012022-06-300000310158mrk:OrganonCoMember2022-06-300000310158mrk:OrganonCoMember2021-12-310000310158mrk:OrganonCoMember2021-06-022021-06-02xbrli:pure0000310158mrk:OrganonCoMember2021-04-012021-06-300000310158mrk:OrganonCoMember2021-01-012021-06-300000310158us-gaap:SubsequentEventMembermrk:OrionCorporationMemberus-gaap:LicensingAgreementsMember2022-07-012022-07-310000310158us-gaap:SubsequentEventMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMember2022-07-012022-07-310000310158us-gaap:SubsequentEventMembermrk:DevelopmentMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMember2022-07-012022-07-310000310158us-gaap:SubsequentEventMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMembermrk:RegulatoryMilestonesMemberus-gaap:LicensingAgreementsMember2022-07-012022-07-310000310158us-gaap:SubsequentEventMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMember2022-07-012022-07-310000310158mrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMember2022-05-012022-05-310000310158mrk:DevelopmentMilestonesMembermrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMember2022-05-012022-05-310000310158mrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMembermrk:FirstCommercialSaleMilestonesMember2022-05-012022-05-310000310158mrk:SichuanKelunBiotechBiopharmaceuticalCoLtdMemberus-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMember2022-05-012022-05-310000310158mrk:PandionTherapeuticsMember2021-04-012021-04-300000310158mrk:PandionTherapeuticsMember2021-04-300000310158mrk:PandionTherapeuticsMember2021-01-012021-06-300000310158mrk:ArtivaBiotherapeuticsIncMemberus-gaap:LicensingAgreementsMember2021-01-012021-01-310000310158mrk:DevelopmentMilestonesMembermrk:ArtivaBiotherapeuticsIncMemberus-gaap:LicensingAgreementsMember2021-01-012021-01-310000310158mrk:RegulatoryMilestonesMembermrk:ArtivaBiotherapeuticsIncMemberus-gaap:LicensingAgreementsMember2021-01-012021-01-310000310158mrk:ArtivaBiotherapeuticsIncMemberus-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMember2021-01-012021-01-310000310158mrk:ArtivaBiotherapeuticsIncMemberus-gaap:LicensingAgreementsMembersrt:MinimumMember2021-01-012021-01-310000310158srt:MaximumMembermrk:ArtivaBiotherapeuticsIncMemberus-gaap:LicensingAgreementsMember2021-01-012021-01-310000310158mrk:COVID19Member2021-04-012021-06-300000310158mrk:COVID19Member2021-01-012021-06-300000310158mrk:AstraZenecaMembermrk:SalesBasedMilestonesMembermrk:LynparzaMember2022-01-012022-03-310000310158mrk:AstraZenecaMembermrk:SalesBasedMilestonesMembermrk:LynparzaMember2022-03-310000310158mrk:LynparzaMember2022-01-012022-03-310000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:LynparzaMember2022-01-012022-06-300000310158mrk:AstraZenecaMembermrk:SalesBasedMilestonesMembermrk:LynparzaMember2022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMembermrk:LynparzaMember2022-06-300000310158us-gaap:OtherNoncurrentAssetsMembermrk:LynparzaMember2022-06-300000310158mrk:AstraZenecaMembermrk:AlliancerevenueLynparzaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:AstraZenecaMembermrk:AlliancerevenueLynparzaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:AstraZenecaMembermrk:AlliancerevenueLynparzaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:AstraZenecaMembermrk:AlliancerevenueLynparzaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AllianceRevenueKoselugoMember2022-04-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AllianceRevenueKoselugoMember2021-04-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AllianceRevenueKoselugoMember2022-01-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMembermrk:AllianceRevenueKoselugoMember2021-01-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-04-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-04-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-01-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-01-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:OtherCurrentAssetsMember2022-06-300000310158mrk:AstraZenecaMemberus-gaap:CollaborativeArrangementMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158mrk:AstraZenecaMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:CollaborativeArrangementMember2022-06-300000310158mrk:AstraZenecaMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158mrk:AstraZenecaMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CollaborativeArrangementMember2022-06-300000310158mrk:AstraZenecaMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158mrk:EisaiMember2021-03-012021-03-310000310158mrk:EisaiMembermrk:LenvimaMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2022-01-012022-06-300000310158mrk:EisaiMembermrk:LenvimaMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2022-06-300000310158mrk:LenvimaMemberus-gaap:OtherNoncurrentAssetsMember2022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158mrk:EisaiMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-04-012022-06-300000310158mrk:EisaiMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-04-012021-06-300000310158mrk:EisaiMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-01-012022-06-300000310158mrk:EisaiMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-01-012021-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:OtherCurrentAssetsMember2022-06-300000310158mrk:EisaiMemberus-gaap:CollaborativeArrangementMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:EisaiMemberus-gaap:CollaborativeArrangementMember2022-06-300000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:EisaiMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember2022-01-012022-01-310000310158mrk:AdempasMemberus-gaap:OtherIntangibleAssetsMember2022-06-300000310158mrk:VerquvoMemberus-gaap:OtherIntangibleAssetsMember2022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:AdempasMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:AdempasMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:AdempasMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMembermrk:AdempasMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:BayerAGMembermrk:VerquvoMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:BayerAGMembermrk:VerquvoMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:BayerAGMembermrk:VerquvoMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:BayerAGMembermrk:VerquvoMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-04-012022-06-300000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-04-012021-06-300000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-01-012022-06-300000310158mrk:BayerAGMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-01-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:OtherCurrentAssetsMember2022-06-300000310158mrk:BayerAGMemberus-gaap:CollaborativeArrangementMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158mrk:BayerAGMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:CollaborativeArrangementMember2022-06-300000310158mrk:BayerAGMemberus-gaap:AccountsPayableAndAccruedLiabilitiesMemberus-gaap:CollaborativeArrangementMember2021-12-31mrk:marketmrk:course0000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-04-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-04-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2022-01-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMembermrk:LagevrioMemberus-gaap:CollaborativeArrangementMemberus-gaap:SalesMember2021-01-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-04-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-04-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2022-01-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:CollaborativeArrangementMember2021-01-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158mrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2022-06-300000310158us-gaap:AccountsPayableAndAccruedLiabilitiesMembermrk:RidgebackBiotherapeuticsLPMemberus-gaap:CollaborativeArrangementMember2021-12-310000310158mrk:BristolMyersSquibbMemberus-gaap:LicensingAgreementsMembersrt:MinimumMember2022-01-012022-06-300000310158srt:MaximumMembermrk:BristolMyersSquibbMemberus-gaap:LicensingAgreementsMember2022-01-012022-06-300000310158mrk:BristolMyersSquibbMemberus-gaap:LicensingAgreementsMember2022-01-012022-06-300000310158mrk:BristolMyersSquibbMemberus-gaap:LicensingAgreementsMembermrk:SalesBasedMilestonesMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RegulatoryMilestonesMembermrk:BristolMyersSquibbMemberus-gaap:LicensingAgreementsMember2022-01-012022-06-300000310158srt:ScenarioForecastMember2022-12-310000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:CostOfSalesMember2022-04-012022-06-300000310158us-gaap:CostOfSalesMember2022-04-012022-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:CostOfSalesMember2022-01-012022-06-300000310158us-gaap:CostOfSalesMember2022-01-012022-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OneTimeTerminationBenefitsMember2022-04-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2022-04-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2022-04-012022-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2022-04-012022-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OneTimeTerminationBenefitsMember2022-01-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2022-01-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2022-01-012022-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2022-01-012022-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158us-gaap:ResearchAndDevelopmentExpenseMember2022-04-012022-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158us-gaap:ResearchAndDevelopmentExpenseMember2022-01-012022-06-300000310158us-gaap:RestructuringChargesMemberus-gaap:OneTimeTerminationBenefitsMember2022-04-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2022-04-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2022-04-012022-06-300000310158us-gaap:RestructuringChargesMember2022-04-012022-06-300000310158us-gaap:RestructuringChargesMemberus-gaap:OneTimeTerminationBenefitsMember2022-01-012022-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2022-01-012022-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2022-01-012022-06-300000310158us-gaap:RestructuringChargesMember2022-01-012022-06-300000310158us-gaap:OneTimeTerminationBenefitsMember2022-04-012022-06-300000310158mrk:AcceleratedDepreciationMember2022-04-012022-06-300000310158us-gaap:OtherRestructuringMember2022-04-012022-06-300000310158us-gaap:OneTimeTerminationBenefitsMember2022-01-012022-06-300000310158mrk:AcceleratedDepreciationMember2022-01-012022-06-300000310158us-gaap:OtherRestructuringMember2022-01-012022-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:CostOfSalesMember2021-04-012021-06-300000310158us-gaap:CostOfSalesMember2021-04-012021-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:CostOfSalesMember2021-01-012021-06-300000310158us-gaap:CostOfSalesMember2021-01-012021-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OneTimeTerminationBenefitsMember2021-04-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2021-04-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2021-04-012021-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2021-04-012021-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMemberus-gaap:OneTimeTerminationBenefitsMember2021-01-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2021-01-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:SellingGeneralAndAdministrativeExpensesMember2021-01-012021-06-300000310158us-gaap:SellingGeneralAndAdministrativeExpensesMember2021-01-012021-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158us-gaap:ResearchAndDevelopmentExpenseMember2021-04-012021-06-300000310158us-gaap:OneTimeTerminationBenefitsMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158us-gaap:ResearchAndDevelopmentExpenseMember2021-01-012021-06-300000310158us-gaap:RestructuringChargesMemberus-gaap:OneTimeTerminationBenefitsMember2021-04-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2021-04-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2021-04-012021-06-300000310158us-gaap:RestructuringChargesMember2021-04-012021-06-300000310158us-gaap:RestructuringChargesMemberus-gaap:OneTimeTerminationBenefitsMember2021-01-012021-06-300000310158mrk:AcceleratedDepreciationMemberus-gaap:RestructuringChargesMember2021-01-012021-06-300000310158us-gaap:OtherRestructuringMemberus-gaap:RestructuringChargesMember2021-01-012021-06-300000310158us-gaap:RestructuringChargesMember2021-01-012021-06-300000310158us-gaap:OneTimeTerminationBenefitsMember2021-04-012021-06-300000310158mrk:AcceleratedDepreciationMember2021-04-012021-06-300000310158us-gaap:OtherRestructuringMember2021-04-012021-06-300000310158us-gaap:OneTimeTerminationBenefitsMember2021-01-012021-06-300000310158mrk:AcceleratedDepreciationMember2021-01-012021-06-300000310158us-gaap:OtherRestructuringMember2021-01-012021-06-300000310158us-gaap:OneTimeTerminationBenefitsMember2021-12-310000310158mrk:AcceleratedDepreciationMember2021-12-310000310158us-gaap:OtherRestructuringMember2021-12-310000310158us-gaap:OneTimeTerminationBenefitsMember2022-06-300000310158mrk:AcceleratedDepreciationMember2022-06-300000310158us-gaap:OtherRestructuringMember2022-06-300000310158srt:MaximumMemberus-gaap:DesignatedAsHedgingInstrumentMember2022-01-012022-06-300000310158srt:MaximumMemberus-gaap:NondesignatedMember2022-01-012022-06-300000310158us-gaap:ForeignExchangeContractMember2022-04-012022-06-300000310158us-gaap:ForeignExchangeContractMember2021-04-012021-06-300000310158us-gaap:ForeignExchangeContractMember2022-01-012022-06-300000310158us-gaap:ForeignExchangeContractMember2021-01-012021-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000310158mrk:EurodominatedNotesMember2022-04-012022-06-300000310158mrk:EurodominatedNotesMember2021-04-012021-06-300000310158mrk:EurodominatedNotesMember2022-01-012022-06-300000310158mrk:EurodominatedNotesMember2021-01-012021-06-300000310158mrk:EurodominatedNotesMemberus-gaap:OtherNonoperatingIncomeExpenseMember2022-04-012022-06-300000310158mrk:EurodominatedNotesMemberus-gaap:OtherNonoperatingIncomeExpenseMember2021-04-012021-06-300000310158mrk:EurodominatedNotesMemberus-gaap:OtherNonoperatingIncomeExpenseMember2022-01-012022-06-300000310158mrk:EurodominatedNotesMemberus-gaap:OtherNonoperatingIncomeExpenseMember2021-01-012021-06-300000310158us-gaap:InterestRateSwapMember2022-02-280000310158mrk:A2.35NotesDue2022Member2022-02-280000310158mrk:A2.40NotesDue2022Memberus-gaap:InterestRateSwapMember2022-06-300000310158mrk:LongTermDebtCurrentMaturitiesMember2022-06-300000310158mrk:LongTermDebtCurrentMaturitiesMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMemberus-gaap:OtherCurrentAssetsMember2022-06-300000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateContractMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMember2022-06-300000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherAssetsMemberus-gaap:ForeignExchangeContractMember2022-06-300000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherAssetsMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:AccruedLiabilitiesMember2022-06-300000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:ForeignExchangeContractMemberus-gaap:AccruedLiabilitiesMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:ForeignExchangeContractMember2022-06-300000310158us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:DesignatedAsHedgingInstrumentMember2022-06-300000310158us-gaap:DesignatedAsHedgingInstrumentMember2021-12-310000310158us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMember2022-06-300000310158us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMemberus-gaap:OtherCurrentAssetsMember2021-12-310000310158us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMemberus-gaap:AccruedLiabilitiesMember2022-06-300000310158us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMemberus-gaap:AccruedLiabilitiesMember2021-12-310000310158us-gaap:NondesignatedMember2022-06-300000310158us-gaap:NondesignatedMember2021-12-310000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateSwapMember2022-04-012022-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateSwapMember2021-04-012021-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateSwapMember2022-01-012022-06-300000310158us-gaap:OtherNonoperatingIncomeExpenseMemberus-gaap:InterestRateSwapMember2021-01-012021-06-300000310158us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ForeignExchangeContractMember2022-04-012022-06-300000310158us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ForeignExchangeContractMember2021-04-012021-06-300000310158us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ForeignExchangeContractMember2022-01-012022-06-300000310158us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMemberus-gaap:ForeignExchangeContractMember2021-01-012021-06-300000310158us-gaap:InterestRateSwapMember2022-04-012022-06-300000310158us-gaap:InterestRateSwapMember2021-04-012021-06-300000310158us-gaap:InterestRateSwapMember2022-01-012022-06-300000310158us-gaap:InterestRateSwapMember2021-01-012021-06-300000310158us-gaap:CurrencySwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2022-04-012022-06-300000310158us-gaap:CurrencySwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2021-04-012021-06-300000310158us-gaap:CurrencySwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2022-01-012022-06-300000310158us-gaap:CurrencySwapMemberus-gaap:OtherNonoperatingIncomeExpenseMember2021-01-012021-06-300000310158us-gaap:ForeignExchangeFutureMemberus-gaap:SalesMember2022-04-012022-06-300000310158us-gaap:ForeignExchangeFutureMemberus-gaap:SalesMember2021-04-012021-06-300000310158us-gaap:ForeignExchangeFutureMemberus-gaap:SalesMember2022-01-012022-06-300000310158us-gaap:ForeignExchangeFutureMemberus-gaap:SalesMember2021-01-012021-06-300000310158us-gaap:CommercialPaperMember2022-06-300000310158us-gaap:CommercialPaperMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMember2022-06-300000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMember2021-12-310000310158us-gaap:CorporateDebtSecuritiesMember2022-06-300000310158us-gaap:CorporateDebtSecuritiesMember2021-12-310000310158us-gaap:ForeignGovernmentDebtSecuritiesMember2022-06-300000310158us-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000310158us-gaap:EquityFundsMember2022-04-012022-06-300000310158us-gaap:EquityFundsMember2021-04-012021-06-300000310158us-gaap:EquityFundsMember2022-01-012022-06-300000310158us-gaap:EquityFundsMember2021-01-012021-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommercialPaperMember2021-12-310000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignGovernmentDebtSecuritiesMember2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2022-06-300000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMember2021-12-310000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateDebtSecuritiesMember2021-12-310000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeContractMember2021-12-310000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:ForeignExchangeOptionMember2021-12-310000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2022-06-300000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2022-06-300000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2022-06-300000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2022-06-300000310158us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2021-12-310000310158us-gaap:FairValueInputsLevel2Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2021-12-310000310158us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2021-12-310000310158us-gaap:FairValueMeasurementsRecurringMemberus-gaap:InterestRateSwapMember2021-12-310000310158us-gaap:FairValueInputsLevel2Member2022-06-300000310158us-gaap:FairValueInputsLevel2Member2021-12-310000310158mrk:SanofiPasteurMember2022-06-300000310158us-gaap:MeasurementInputDiscountRateMembermrk:SanofiPasteurMember2022-03-310000310158us-gaap:MeasurementInputDiscountRateMembermrk:SanofiPasteurMember2022-06-3000003101582021-01-012021-12-310000310158mrk:InventoryNotExpectedtobeSoldWithinOneYearMember2022-06-300000310158mrk:InventoryNotExpectedtobeSoldWithinOneYearMember2021-12-310000310158mrk:InventoriesProducedinPreparationforProductLaunchesMember2022-06-300000310158mrk:InventoriesProducedinPreparationforProductLaunchesMember2021-12-310000310158mrk:FosamaxMember2022-06-30mrk:case0000310158mrk:FemurFractureLitigationMembermrk:FederalMembermrk:FosamaxMember2014-03-012014-03-310000310158mrk:OtherStateCourtMembermrk:JanuviaMember2022-06-30mrk:claim0000310158mrk:JanuviaMembermrk:CasesCompanyAgreedToTollStatuteOfLimitationsMember2022-06-300000310158mrk:ZetiaantitrustlitigationMember2020-08-310000310158mrk:ZetiaantitrustlitigationMemberus-gaap:PendingLitigationMember2022-01-012022-06-300000310158us-gaap:PatentsMembermrk:BridionMember2022-01-012022-06-300000310158us-gaap:PatentsMembermrk:BridionMemberus-gaap:PendingLitigationMember2022-06-300000310158us-gaap:PatentsMembermrk:JanuviaAndJanumetMember2022-01-012022-06-300000310158mrk:LegalDefenseCostsMember2022-06-300000310158mrk:LegalDefenseCostsMember2021-12-310000310158us-gaap:CommonStockMember2021-03-310000310158us-gaap:AdditionalPaidInCapitalMember2021-03-310000310158us-gaap:RetainedEarningsMember2021-03-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-03-310000310158us-gaap:TreasuryStockCommonMember2021-03-310000310158us-gaap:NoncontrollingInterestMember2021-03-3100003101582021-03-310000310158us-gaap:RetainedEarningsMember2021-04-012021-06-300000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-04-012021-06-300000310158us-gaap:TreasuryStockCommonMember2021-04-012021-06-300000310158us-gaap:AdditionalPaidInCapitalMember2021-04-012021-06-300000310158us-gaap:NoncontrollingInterestMember2021-04-012021-06-300000310158us-gaap:CommonStockMember2021-06-300000310158us-gaap:AdditionalPaidInCapitalMember2021-06-300000310158us-gaap:RetainedEarningsMember2021-06-300000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000310158us-gaap:TreasuryStockCommonMember2021-06-300000310158us-gaap:NoncontrollingInterestMember2021-06-300000310158us-gaap:CommonStockMember2022-03-310000310158us-gaap:AdditionalPaidInCapitalMember2022-03-310000310158us-gaap:RetainedEarningsMember2022-03-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-03-310000310158us-gaap:TreasuryStockCommonMember2022-03-310000310158us-gaap:NoncontrollingInterestMember2022-03-3100003101582022-03-310000310158us-gaap:RetainedEarningsMember2022-04-012022-06-300000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-04-012022-06-300000310158us-gaap:AdditionalPaidInCapitalMember2022-04-012022-06-300000310158us-gaap:TreasuryStockCommonMember2022-04-012022-06-300000310158us-gaap:NoncontrollingInterestMember2022-04-012022-06-300000310158us-gaap:CommonStockMember2022-06-300000310158us-gaap:AdditionalPaidInCapitalMember2022-06-300000310158us-gaap:RetainedEarningsMember2022-06-300000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-06-300000310158us-gaap:TreasuryStockCommonMember2022-06-300000310158us-gaap:NoncontrollingInterestMember2022-06-300000310158us-gaap:CommonStockMember2020-12-310000310158us-gaap:AdditionalPaidInCapitalMember2020-12-310000310158us-gaap:RetainedEarningsMember2020-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000310158us-gaap:TreasuryStockCommonMember2020-12-310000310158us-gaap:NoncontrollingInterestMember2020-12-310000310158us-gaap:RetainedEarningsMember2021-01-012021-06-300000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-06-300000310158us-gaap:TreasuryStockCommonMember2021-01-012021-06-300000310158us-gaap:AdditionalPaidInCapitalMember2021-01-012021-06-300000310158us-gaap:NoncontrollingInterestMember2021-01-012021-06-300000310158us-gaap:CommonStockMember2021-12-310000310158us-gaap:AdditionalPaidInCapitalMember2021-12-310000310158us-gaap:RetainedEarningsMember2021-12-310000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-12-310000310158us-gaap:TreasuryStockCommonMember2021-12-310000310158us-gaap:NoncontrollingInterestMember2021-12-310000310158us-gaap:RetainedEarningsMember2022-01-012022-06-300000310158us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-01-012022-06-300000310158us-gaap:AdditionalPaidInCapitalMember2022-01-012022-06-300000310158us-gaap:TreasuryStockCommonMember2022-01-012022-06-300000310158us-gaap:NoncontrollingInterestMember2022-01-012022-06-300000310158us-gaap:PensionPlansDefinedBenefitMember2022-01-012022-06-300000310158country:USus-gaap:PensionPlansDefinedBenefitMember2022-04-012022-06-300000310158us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2022-04-012022-06-300000310158country:USus-gaap:PensionPlansDefinedBenefitMember2021-04-012021-06-300000310158us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2021-04-012021-06-300000310158country:USus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-06-300000310158us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2022-01-012022-06-300000310158country:USus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-06-300000310158us-gaap:ForeignPlanMemberus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-06-300000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-01-012022-06-300000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2022-04-012022-06-300000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-04-012021-06-300000310158us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-06-300000310158us-gaap:SubsequentEventMembersrt:ScenarioForecastMember2022-07-012022-09-300000310158us-gaap:DomesticCountryMemberus-gaap:SegmentContinuingOperationsMemberus-gaap:InternalRevenueServiceIRSMember2021-01-012021-06-300000310158us-gaap:DomesticCountryMemberus-gaap:InternalRevenueServiceIRSMember2021-01-012021-03-310000310158us-gaap:DomesticCountryMemberus-gaap:SegmentContinuingOperationsMemberus-gaap:InternalRevenueServiceIRSMember2021-01-012021-03-310000310158us-gaap:DomesticCountryMemberus-gaap:SegmentDiscontinuedOperationsMemberus-gaap:InternalRevenueServiceIRSMember2021-01-012021-03-310000310158us-gaap:DomesticCountryMemberus-gaap:InternalRevenueServiceIRSMember2021-01-012021-06-300000310158us-gaap:DomesticCountryMemberus-gaap:SegmentDiscontinuedOperationsMemberus-gaap:InternalRevenueServiceIRSMember2021-01-012021-06-300000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-03-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-03-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-03-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-04-012021-06-300000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-04-012021-06-300000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-04-012021-06-300000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-06-300000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-06-300000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-06-300000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-03-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-03-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2022-03-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-04-012022-06-300000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-04-012022-06-300000310158us-gaap:AccumulatedTranslationAdjustmentMember2022-04-012022-06-300000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-06-300000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-06-300000310158us-gaap:AccumulatedTranslationAdjustmentMember2022-06-300000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2020-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-01-012021-06-300000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-06-300000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-06-300000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2021-12-310000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-12-310000310158us-gaap:AccumulatedTranslationAdjustmentMember2021-12-310000310158us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember2022-01-012022-06-300000310158us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-01-012022-06-300000310158us-gaap:AccumulatedTranslationAdjustmentMember2022-01-012022-06-30mrk:segment0000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:KeytrudaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AlliancerevenueLynparzaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LenvimaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueReblozylMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:GardasilGardasil9Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:ProQuadMMRIIVarivaxMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:RotateqMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:Pneumovax23Membermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:VaqtaMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMembermrk:BridionMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMembermrk:BridionMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMembermrk:BridionMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMembermrk:BridionMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMembermrk:BridionMember2021-01-012021-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PrevymisMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:PrimaxinMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:DificidMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:NoxafilMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InvanzMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:CancidasMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:ZerbaxaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AllianceRevenueAdempasVerquvoMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:AdempasMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:LagevrioMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:IsentressIsentressHDMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:BelsomraMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:SimponiMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:RemicadeMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:JanuviaMembermrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:JanumetMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:OtherPharmaceuticalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:PharmaceuticalsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMembermrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:PharmaceuticalsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:AnimalHealthsegmentMembermrk:LivestockMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:CompanionAnimalsMembermrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:CompanionAnimalsMembermrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:CompanionAnimalsMembermrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:CompanionAnimalsMembermrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:CompanionAnimalsMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:AnimalHealthsegmentMembercountry:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:InternationalMembermrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:AnimalHealthsegmentMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158country:USus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158mrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158us-gaap:OperatingSegmentsMember2022-04-012022-06-300000310158country:USus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158mrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158us-gaap:OperatingSegmentsMember2021-04-012021-06-300000310158country:USus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158mrk:InternationalMemberus-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158us-gaap:OperatingSegmentsMember2022-01-012022-06-300000310158country:USus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158mrk:InternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158us-gaap:OperatingSegmentsMember2021-01-012021-06-300000310158us-gaap:CorporateNonSegmentMembercountry:US2022-04-012022-06-300000310158mrk:InternationalMemberus-gaap:CorporateNonSegmentMember2022-04-012022-06-300000310158us-gaap:CorporateNonSegmentMember2022-04-012022-06-300000310158us-gaap:CorporateNonSegmentMembercountry:US2021-04-012021-06-300000310158mrk:InternationalMemberus-gaap:CorporateNonSegmentMember2021-04-012021-06-300000310158us-gaap:CorporateNonSegmentMember2021-04-012021-06-300000310158us-gaap:CorporateNonSegmentMembercountry:US2022-01-012022-06-300000310158mrk:InternationalMemberus-gaap:CorporateNonSegmentMember2022-01-012022-06-300000310158us-gaap:CorporateNonSegmentMember2022-01-012022-06-300000310158us-gaap:CorporateNonSegmentMembercountry:US2021-01-012021-06-300000310158mrk:InternationalMemberus-gaap:CorporateNonSegmentMember2021-01-012021-06-300000310158us-gaap:CorporateNonSegmentMember2021-01-012021-06-300000310158country:US2022-04-012022-06-300000310158mrk:InternationalMember2022-04-012022-06-300000310158country:US2021-04-012021-06-300000310158mrk:InternationalMember2021-04-012021-06-300000310158country:US2022-01-012022-06-300000310158mrk:InternationalMember2022-01-012022-06-300000310158country:US2021-01-012021-06-300000310158mrk:InternationalMember2021-01-012021-06-300000310158us-gaap:EMEAMember2022-04-012022-06-300000310158us-gaap:EMEAMember2021-04-012021-06-300000310158us-gaap:EMEAMember2022-01-012022-06-300000310158us-gaap:EMEAMember2021-01-012021-06-300000310158country:CN2022-04-012022-06-300000310158country:CN2021-04-012021-06-300000310158country:CN2022-01-012022-06-300000310158country:CN2021-01-012021-06-300000310158country:JP2022-04-012022-06-300000310158country:JP2021-04-012021-06-300000310158country:JP2022-01-012022-06-300000310158country:JP2021-01-012021-06-300000310158srt:AsiaPacificMember2022-04-012022-06-300000310158srt:AsiaPacificMember2021-04-012021-06-300000310158srt:AsiaPacificMember2022-01-012022-06-300000310158srt:AsiaPacificMember2021-01-012021-06-300000310158srt:LatinAmericaMember2022-04-012022-06-300000310158srt:LatinAmericaMember2021-04-012021-06-300000310158srt:LatinAmericaMember2022-01-012022-06-300000310158srt:LatinAmericaMember2021-01-012021-06-300000310158mrk:OtherCountriesMember2022-04-012022-06-300000310158mrk:OtherCountriesMember2021-04-012021-06-300000310158mrk:OtherCountriesMember2022-01-012022-06-300000310158mrk:OtherCountriesMember2021-01-012021-06-300000310158us-gaap:MaterialReconcilingItemsMember2022-04-012022-06-300000310158us-gaap:MaterialReconcilingItemsMember2021-04-012021-06-300000310158us-gaap:MaterialReconcilingItemsMember2022-01-012022-06-300000310158us-gaap:MaterialReconcilingItemsMember2021-01-012021-06-30