REGN


Line plots across dimensions of each concept
Tables

Table of contents


us-gaap:StatementClassOfStock
us-gaap:CommonStockValue
us-gaap:StatementClassOfStock
us-gaap:SharesOutstanding
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesAuthorized

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ProductOrService, us-gaap:StatementGeographical
us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:Revenues
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold
us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:CostsAndExpenses

us-gaap:ResearchAndDevelopmentExpense
us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss

us-gaap:InterestExpense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense

us-gaap:IncomeTaxExpenseBenefit

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:Assets

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesNoncurrent
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:CommonStockValue

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:TreasuryStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:ShareBasedCompensation

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
regn:ReimbursementOfOtherExpenses
us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
regn:ReimbursementOfResearchAndDevelopmentExpense
us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
regn:ReimbursementOfSellingGeneralAndAdministrativeExpense
us-gaap:Range, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
regn:RevenuebasedonpercentageofannualsalesinJapan
us-gaap:StatementEquityComponents
regn:StockIssuedDistributedDuringPeriodSharesEmployeeBenefitPlan

regn:StockIssuedDistributedDuringPeriodValueEmployeeBenefitPlan
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
us-gaap:AwardType
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax

us-gaap:OtherNoncashIncomeExpense
us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:OtherOperatingIncome

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireMarketableSecurities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities
us-gaap:StatementClassOfStock
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:TreasuryStockSharesAcquired
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValueAcquiredCostMethod
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ShareRepurchaseProgram
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
dei:EntityCommonStockSharesOutstanding

regn:AccruedCapitalExpenditures
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
regn:Maximumsharesthecollaboratorcouldsell
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
regn:UnsatisfiedObligation

us-gaap:AccountsAndNotesReceivableNet
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:AccountsPayableCurrentAndNoncurrent

us-gaap:AccountsReceivableRelatedPartiesCurrent
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:AccruedLiabilitiesAndOtherLiabilities

us-gaap:AdditionalPaidInCapital

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument, regn:ClassificationOfInvestment
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ContractWithCustomerLiability
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ContractWithCustomerLiabilityCurrent
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition
us-gaap:FinancialInstrument

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
us-gaap:FinancialInstrument

us-gaap:DeferredIncomeTaxAssetsNet
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, regn:ClassificationOfInvestment
us-gaap:EquitySecuritiesFvNi
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, regn:ClassificationOfInvestment

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:LossContingencyAccrualAtCarryingValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:MarketableSecurities
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:MarketableSecuritiesCurrent

us-gaap:MarketableSecuritiesNoncurrent

us-gaap:OtherInventoryNetOfReserves
us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:OtherLiabilities

us-gaap:PreferredStockSharesAuthorized

us-gaap:PreferredStockValue

us-gaap:TreasuryStockShares

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁▁▁▁▁████████████████████████████████0.00.00.00.00.00.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.0NANANA2000.0NANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonStock▃▃▃▃▃▃██████▇▇▇▇▇▆▆▆▅▄▃▃▃▂▂▂▁▁100000.0100000.0100000.0100000.0100000.0100000.0110000.0110000.0110000.0110000.0109000.0109000.0108000.0108000.0107000.0107000.0107000.0106000.0106000.0105000.0103000.0102000.0100000.0100000.099000.097000.097000.097000.095000.095000.0NANANA91000.0NANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA▄▄▄▄▄▄▄▄▄▄1111111111NANANA1NANANA1NANANA1NANANA2NANANA2NANANA2NANANANANANANANANANA
 us-gaap:SharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonStock█▅▄▃▃▃▂▁▁▁116113112111111111110109109109NANANA107NANANA106NANANA102NANANA97NANANA95NANANA90NANANANANANANANANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██▁▁▁▁▁11111111111111111111111122222222089208922222NANANA2NANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonStock█▇▇▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▄▄▄▃▃▂▂▂▂▁▁▁11611311211111111111010910910910910810810710710710610610510510310210099989797969595NANANA90NANANANANANANANANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██▁▁▁▁▁11111111111111111111111122222222089208922222NANANA2NANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██▁▁▁▁▁4040404040404040404040404040404040404040404040404040404040404040000400004040404040NANANA40NANA
 us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock us-gaap:CommonStock████████████████████▁▁▁▁▁▁▁▁▁▁320320320320320320320320320320320320320320320320320320320320160160160160160160160160160160NANANA160NANANANANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 115NA114114115NA115114114NA117116115NA116116114NA115115114NA117113112NA116111109NA115110107NA919089NANANANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 109NA109109108NA108107107NA106106105NA104104104NA103102102NA10010098NA989796NA959493NA919089NANANANANANANA
us-gaap:EarningsPerShareBasic ▆█▇▃▅█▆▆▅▂▄▄▃▃▃▃▂▂▃▃▂▂▂▂▂▂▂▂▂▆▃▂▁5.697.256.121.774.237.585.55.124.441.623.643.662.362.412.531.881.591.492.041.890.741.090.790.920.660.981.440.891.024.922.020.810.12NA-0.68-0.69-0.49NANANANANANANA
us-gaap:EarningsPerShareDiluted ▆█▇▃▅█▆▆▅▂▄▄▃▃▃▃▂▂▃▃▂▂▂▂▁▂▂▂▂▅▃▂▁5.436.935.861.683.997.155.174.824.161.53.323.342.162.192.271.691.451.341.821.690.660.960.70.820.580.861.250.790.94.081.720.70.11NA-0.68-0.69-0.49NANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▇██▇▆▇▆▆▆▆▆▆▅▅▅▅▅▄▅▄▄▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁18282169204819331711192716631608151115821500147013191226122012121200109811379988698027256656256105974574394144273042311221021071121331051151039611790
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:Product▇█▇▆▄▄▃▂▂▂▂▁1236128612381205110410961025996987978957924NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject us-gaap:ProductAndServiceOther,regn:BayerCollaborationAgreement▄█▆▅▄▆▃▂▁281320302289276301264262247NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject us-gaap:ProductAndServiceOther,regn:SanofiCollaborationAgreement▃█▇▆▃█▃▂▁▁▃▂246427404349246427256237189199245222NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical regn:EyleaNetProductSales,country:US▇█▇▇▅▅▃▃▃▂▂▁1172122211871160107410781021991984974953919NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical us-gaap:Product,country:US▇█▇▆▄▄▃▂▂▂▂▁1236128612381205110410961025996987978957924NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementGeographical,us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject regn:NetProfitInConnectionWithCommercialization,us-gaap:NonUs,regn:BayerCollaborationAgreement▃█▆▅▃▅▂▂▁253298275269249270243246232NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Revenues ▇██▇▆▇▆▆▆▆▆▆▅▅▅▅▅▄▅▄▄▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁18282169204819331711192716631608151115821500147013181226122012121200109811379988698027256656256105974574394144273042311221021071121331051151039611790
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService regn:CollaborationandContractManufacturing█▆▆▄▆▃▄▂▁▂▂▂1381151108510873795545535760NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:Product▅▇█▄▄▂▁▁▄▃▂▂78108115677043303569524642NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject regn:SanofisShareofLibtayoU.S.GrossProfits,regn:SanofiCollaborationAgreementImmunooncology26NANANA12NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▅▇▆█▆▆▅▄▄▅▄▄▄▄▃▄▄▄▃▂▂▂▂▁▁11281493130916181231120910369859441043940919888879857921871866745653586586543443439NA360299286NA225216209168161168153146138139132136118106
us-gaap:ResearchAndDevelopmentExpense ▄▅▄█▄▄▃▃▃▃▃▃▃▃▃▄▃▃▂▂▂▂▁▁▁5836836631048641601556529498527529509507479543559470461425390343351337294287NA224187180NA15814713812912714312912512212411711810594
us-gaap:SellingGeneralAndAdministrativeExpense ▅█▆▆▅▇▅▅▄▅▄▄▄▄▃▄▄▄▃▂▂▂▂▁▁367586419417410491369364330409306306296325270292289294209174158175149102108NA977277NA4647583632242320151414171211
us-gaap:OperatingIncomeLoss █▇█▃▅█▇▇▆▅▆▆▄▃▃▂▃▂▄▃▂▁▁▂▁700675738315480718626622567538559550430347362291329231392344283215182222185NA236158153NA2028722-45-58-60-40-12-32-23-28-39-1-16
us-gaap:InterestExpense ▃▃▆█▆▆▆▃▃▃▃▁▆6678777666657NANANANA3126691011NA111111NA11111194432222100
us-gaap:OtherNonoperatingIncomeExpense ▂█▄▁▅▂▃▄▃▃▃▂▃▃▃▃▃-2522037-8273-341640242111-199-2313NANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▂█▄▁▅▂▃▄▃▃▃▃▃▃▃▃▃▃▃▃▃▂▃▃▃-3121430-9066-4183318155-241-5300-30-16-7-26-6-19-10NA-11-10-11NA-10-10-10-8-3-3-2-1-1-1-1-101
us-gaap:IncomeTaxExpenseBenefit ▄▄▄▃▄▁▃▄▄█▅▅▅▄▄▄▅▄▅▅▆▄▄▄▄4497983185-144411041073811771381838810196164721821332009996110109NA846042-335NA0NA00000000NANANA
us-gaap:ComprehensiveIncomeNetOfTax ▆█▇▂▅█▆▆▅▂▄▄▃▃▃▂▂▂▂▂▁▂▁▁▁594796670206476818595555468150409395255243256197161155198165711351029568NA1418598NA1917512NA-63-61-43NA-33-26NANANANA
us-gaap:NetIncomeLoss ▆█▇▃▅█▆▆▅▃▅▅▃▄▄▃▃▃▃▃▂▂▂▂▂▂▃▂▂▅▃▂▂▁▁▁▁▁▁▁▁▁▁▁624792669193461820594551477173388387248253264196165154210194761107992659614187984701917611-53-62-62-43-14-33-25-30-36-1-14
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings624NA669193461NA594551478NANANANANANANANANANANANA100799265NANANA98NANA7611-53-62-62-43-14-33-25-30-36-1NA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:Assets ██▇▇▇▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁15757148051393913173128541173410805995193728764870181067817697368286204590456095182452641983871373934563260295126402378227520801660145713501323983104610741089942790NA741NANA
us-gaap:Liabilities ██▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁3624371534343417341029772937276528052620264925852951252423362128213919541886118812271329118710871049998950884869835854862846837554568556561594419NA344NANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇▇▇▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁15757148051393913173128541173410805995193728764870181067817697368286204590456095182452641983871373934563260295126402378227520801660145713501323983104610741089942790NA741NANA
us-gaap:StockholdersEquity █▇▇▇▆▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁121331108910504975594448757786871866567614460515520486644494491407637653654329633382971254225512368221119521690149314061245806594504485428478518527348371386396422410
 us-gaap:StockholdersEquity us-gaap:StatementClassOfStock us-gaap:CommonStock▁▁▁▁▁▁▁▁▁█100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0110000.0NANANA108000.0NANANA106000.0NANANA102000.0NANANA97000.0NANANA95000.0NANANA91000.0NANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█▅▅▄▄▃▂▂▁▁5211442843884263416039113841371236113512NANANA3029NANANA3099NANANA24042423234222362045188218271826176317951775176017541643163016091575137913681357133613231313
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▇▆▅▅▄▃▂▁▁8004737965875918572552544433383932872946NANANA1748NANANA852NANANA25514565-27-92-189-330-418-517-987-1178-1255-1267-1213-1151-1089-1045-1030-997-971-941-904-903
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:AssetsCurrent █▇▇▆▇▆▆▅▅▄▄▄▄▃▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁864476897109665169286447571948144544433541353860366931803501320931332915267522832310216722001918187117961634156113071206948769696652339413325357575417NA425NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue █▆▅▄▆▆▄▄▄▃▃▃▃▂▄▃▃▃▃▂▂▃▃▃▂▂▂▂▁▁▁▁▂▂▁▁▁▁▂▁▁▁▁▂22081617138410451708146710879171019812792744811535920646604809654390507648646600461535263381180230118171394483206254135112325112117207250271
us-gaap:AccountsReceivableNetCurrent ███▇▇▇▇▆▆▆▆▆▅▅▅▆▆▅▅▅▄▃▃▃▄▄▄▄▃▃▃▂▂▁▁▁▁▁▁▁206321002027192017281723166515341531153815321420133913431332143114501152108810711015739673664801787855767703593506349159283231334NA2NANA
us-gaap:InventoryNet ██▇▇▇▆▆▅▅▄▄▄▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁1480141513441317120811511039928820726641554466399345316303238190171133128120109867063574328291063NANANANANANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▅█▅▅▄▅▆▄▄▅▃▄▃▃▃▃▃▄▂▂▁▂▂▂▂▃▄▃▃▂▂▁▁▁▁▁2263872262081822432841631552241431931461301039611516389433471616052961561089756843226221519NA15NANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▇▇▇▇▆▆▆▆▆▅▅▅▄▄▄▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁294428902771267626122575252424612394235822742261227720831872177216661594147513261110974818707600526453419392379372372369367363361357347318292NA259NANA
us-gaap:OtherAssetsNoncurrent █▇▇▇▇▆▆▅▄▄▂▂▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▁▁▁▁▁▁161144137139144127125857877363637202065544433855415202318192019131210666NA7NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:LiabilitiesCurrent ██▇▇▆▆▆▅▅▅▅▄▅▅▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁20552096176517131511144214171331126511351138102913081241961951919811734601536654410351305298268203197163178183160148133135112109133119NA93NANA
us-gaap:OtherLiabilitiesCurrent ▄▄8585NANANANANANANA0000333131322296NANANA0NANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:OtherLiabilitiesNoncurrent ▇▆▆▆██▅▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁32128627326737636119419016915212511510610013511912011577765540231411111010876776767754NA3NANA
 us-gaap:OtherLiabilitiesNoncurrent us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject regn:SanofiCollaborationAgreement▁█450482NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:StockholdersEquity █▇▇▇▆▆▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁121331108910504975594448757786871866567614460515520486644494491407637653654329633382971254225512368221119521690149314061245806594504485428478518527348371386396422410
 us-gaap:StockholdersEquity us-gaap:StatementClassOfStock us-gaap:CommonStock▁▁▁▁▁▁▁▁▁█100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0110000.0NANANA108000.0NANANA106000.0NANANA102000.0NANANA97000.0NANANA95000.0NANANA91000.0NANANANANANANANANANA
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital█▅▅▄▄▃▂▂▁▁5211442843884263416039113841371236113512NANANA3029NANANA3099NANANA24042423234222362045188218271826176317951775176017541643163016091575137913681357133613231313
 us-gaap:StockholdersEquity us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▇▆▅▅▄▃▂▁▁8004737965875918572552544433383932872946NANANA1748NANANA852NANANA25514565-27-92-189-330-418-517-987-1178-1255-1267-1213-1151-1089-1045-1030-997-971-941-904-903
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁▁▁▁▁████████████████████████████████0.00.00.00.00.00.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.0NANANA2000.0NANA
 us-gaap:CommonStockValue us-gaap:StatementClassOfStock us-gaap:CommonStock▃▃▃▃▃▃██████▇▇▇▇▇▆▆▆▅▄▃▃▃▂▂▂▁▁100000.0100000.0100000.0100000.0100000.0100000.0110000.0110000.0110000.0110000.0109000.0109000.0108000.0108000.0107000.0107000.0107000.0106000.0106000.0105000.0103000.0102000.0100000.0100000.099000.097000.097000.097000.095000.095000.0NANANA91000.0NANANANANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▆▆▆▅▅▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁8004737965875918572552544433383932872946277323841997174814951230101885269748729225514565-27-92-189-330-418-517-987-1178-1255-1267-1213-1151-1089-1045-1030-997NA-941NANA
us-gaap:TreasuryStockValue █▆▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▁▂▂1073739488441444396396353316316316316316316316316307306288287181-16943-43NA0NANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▂▅▄▄▃▁▂▁▁▃▅▃▂▁▂▃▃▃▃▅▇█▅▃▃▂▂▂▂▂▂▂▂▂▂▃▂▂▃▃-92116152-12-10-11-150232-5-12-254871947522641-1-2-3-1-1-1-2-1-1-10-2-200NA1NANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▇▆▃█▇▅▄▆▆▅▁▄▄▆▅▂▄█▃▁▃▃▄▂698787557188897728452394618566414-3035537765141529281892243-8719816332753NANANA86NANA-78-87-50-46-34-10-41160-13-9-46-9NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▆▆▁▁▅▅▄▄▅▅▆▆▅▄▅▇▇▅▅▇█▇▇▆-443-208-207-836-776-265-286-484-425-335-358-170-140-271-405-326-43-123-283-371-12956-123-118-236NANANA-147NANA-13915-33014220-353515-136-19-13NA
us-gaap:NetCashProvidedByUsedInFinancingActivities █▂▅▅▆▄▅▅▅▃▅▆▆▁▅▅▄▅▂▅▆▃▅▅▆335-345-11-15119-833-1113-210-813360-49128-46-190-4-3451076-2525-71108NANANA11NANA-5-17361010131821256222NA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▇▇▆▃█▇▅▄▆▆▅▁▄▄▆▅▂▄█▃▁▃▃▄▂698787557188897728452394618566414-3035537765141529281892243-8719816332753NANANA86NANA-78-87-50-46-34-10-41160-13-9-46-9NA
us-gaap:NetIncomeLoss ▆█▇▃▅█▆▆▅▃▅▅▃▄▄▃▃▃▃▃▂▂▂▂▂▂▃▂▂▅▃▂▂▁▁▁▁▁▁▁▁▁▁▁624792669193461820594551477173388387248253264196165154210194761107992659614187984701917611-53-62-62-43-14-33-25-30-36-1-14
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings624NA669193461NA594551478NANANANANANANANANANANANA100799265NANANA98NANA7611-53-62-62-43-14-33-25-30-36-1NA
us-gaap:DepreciationDepletionAndAmortization ██▇▇▇▆▅▄▅▅▅▅▅▄▃▃▃▃▂▂▂▁▁▁▁56545252514235333634373538282725222220151614141311NANANA9NANA987876644443NA
us-gaap:IncreaseDecreaseInInventories ▅█▅█▅█▇▇▇▆▆▆▅▄▂▁▅▃▃▄▁▁▂▂▂▁▁▂▂7010859109581069993887884816950261062303143591321151151317NANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▆▆▁▁▅▅▄▄▅▅▆▆▅▄▅▇▇▅▅▇█▇▇▆-443-208-207-836-776-265-286-484-425-335-358-170-140-271-405-326-43-123-283-371-12956-123-118-236NANANA-147NANA-13915-33014220-353515-136-19-13NA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities █▂▅▅▆▄▅▅▅▃▅▆▆▁▅▅▄▅▂▅▆▃▅▅▆335-345-11-15119-833-1113-210-813360-49128-46-190-4-3451076-2525-71108NANANA11NANA-5-17361010131821256222NA
us-gaap:PaymentsForRepurchaseOfCommonStock █▆▁▁▁▁▁▁▁▁3202461901004000NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30

Common Stock Value

us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.00.00.00.00.00.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.0
Percentage of CommonStockValue0.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value100000.0100000.0100000.0100000.0100000.0100000.0110000.0110000.0110000.0110000.0109000.0109000.0108000.0108000.0107000.0107000.0107000.0106000.0106000.0105000.0103000.0102000.0100000.0100000.099000.097000.097000.097000.095000.095000.091000.0
Percentage of CommonStockValue0.00.00.00.00.00.05500.05500.05500.05500.05450.05450.05400.05400.05350.05350.05350.05300.05300.05250.05150.05100.05000.05000.04950.04850.04850.04850.04750.04750.04550.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Shares Outstanding

us-gaap:StatementClassOfStock

us-gaap:SharesOutstanding

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1111111111111222
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value116113112111111111110109109109107106102979590
Percentage of SharesOutstanding6444.46294.46227.85889.55878.95847.45805.35784.25773.75728.85644.25560.85193.94835.04602.44300.2

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312011-12-31
Value-5-4-4-4-44-4-3-3-3-33-20000000
Percentage of SharesOutstanding-316.7-272.2-233.3-210.5-210.5210.5-210.5-205.3-200.0-197.0-197.0190.4-102.30.00.00.00.00.00.00.0

Shares Issued

Common Stock Shares Issued

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesIssued

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value111111111111111111111111222222220892089222222
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value1161131121111111111101091091091091081081071071071061061051051031021009998979796959590
Percentage of CommonStockSharesIssued6275.26127.16059.65853.95845.05811.85770.25751.45739.65727.75715.85701.15656.35642.85614.15604.85579.35558.55513.65384.95244.75192.95077.44980.34940.54833.84798.34740.94647.64602.04299.2

Common Stock Shares Outstanding

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value111111111111111111111111222222220892089222222
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value404040404040404040404040404040404040404040404040404040404040404000040000404040404040
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value320320320320320320320320320320320320320320320320320320320320160160160160160160160160160160160
Percentage of CommonStockSharesAuthorized800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0800.0400.0400.0400.0400.0400.0400.0400.0400.0400.0400.0400.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value115114114115115114114117116115116116114115115114117113112116111109115110107919089
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value10910910910810810710710610610510410410410310210210010098989796959493919089
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value5.697.256.121.774.237.585.55.124.441.623.643.662.362.412.531.881.591.492.041.890.741.090.790.920.660.981.440.891.024.922.020.810.12-0.68-0.69-0.49
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value5.436.935.861.683.997.155.174.824.161.53.323.342.162.192.271.691.451.341.821.690.660.960.70.820.580.861.250.790.94.081.720.70.11-0.68-0.69-0.49
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value18282169204819331711192716631608151115821500147013191226122012121200109811379988698027256656256105974574394144273042311221021071121331051151039611790
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

us-gaap:Product



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1236128612381205110410961025996987978957924
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax67.659.360.562.364.556.961.662.065.461.963.862.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax67.659.360.562.364.556.961.662.065.461.963.862.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Product100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:ReimbursementForManufacturingOfCommercialSupplies, regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value807378143340
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.43.43.80.81.72.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.43.43.80.81.72.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:ReimbursementForManufacturingOfCommercialSupplies regn:SanofiCollaborationAgreementAntibody100.0100.0100.0100.0100.0100.0

regn:ReimbursementForManufacturingOfCommercialSupplies, regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-03-31
Value20
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:ReimbursementForManufacturingOfCommercialSupplies regn:SanofiCollaborationAgreementImmunooncology100.00.0

regn:ShareOfProfitLossesInConnectionWithCommercialization, regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value1709438-27-38-68
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.34.62.0-1.6-2.3-4.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.34.62.0-1.6-2.3-4.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:ShareOfProfitLossesInConnectionWithCommercialization regn:SanofiCollaborationAgreementAntibody100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther, regn:BayerCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value281320302289276301264262247
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.414.814.814.916.115.615.916.316.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.414.814.814.916.115.615.916.316.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther regn:BayerCollaborationAgreement100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther, regn:OtherRevenue



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value631039022117110
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.55.04.71.37.16.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.55.04.71.37.16.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther regn:OtherRevenue100.0100.0100.0100.0100.0100.0

us-gaap:ProductAndServiceOther, regn:SanofiCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value246427404349246427256237189199245222
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.519.719.718.114.422.215.414.812.512.616.315.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.519.719.718.114.422.215.414.812.512.616.315.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductAndServiceOther regn:SanofiCollaborationAgreement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementGeographical

regn:ArcalystNetProductSales, country:US



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value333432343344
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.20.20.10.20.30.30.30.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.20.10.20.20.10.20.30.30.30.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:ArcalystNetProductSales country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

regn:EyleaNetProductSales, country:US



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1172122211871160107410781021991984974953919
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax64.156.358.060.062.756.061.461.765.161.663.562.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax64.156.358.060.062.756.061.461.765.161.663.562.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:EyleaNetProductSales country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

regn:LIBTAYONetProductSales, country:US



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value616047402614000
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.42.82.32.11.60.80.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.42.82.32.11.60.80.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:LIBTAYONetProductSales country:US100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:Product, country:US



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1236128612381205110410961025996987978957924
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax67.659.360.562.364.556.961.662.065.461.963.862.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax67.659.360.562.364.556.961.662.065.461.963.862.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Product country:US100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:NetProfitInConnectionWithCommercialization, us-gaap:NonUs, regn:BayerCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value253298275269249270243246232
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.913.713.413.914.614.014.615.315.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.913.713.413.914.614.014.615.315.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:NetProfitInConnectionWithCommercialization us-gaap:NonUs regn:BayerCollaborationAgreement100.0100.0100.0100.0100.0100.0100.0100.0100.0

regn:ReimbursementForManufacturingOfCommercialSupplies, us-gaap:NonUs, regn:BayerCollaborationAgreement



Period End2020-03-312019-03-31
Value2714
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:ReimbursementForManufacturingOfCommercialSupplies us-gaap:NonUs regn:BayerCollaborationAgreement100.0100.0

regn:ShareOfProfitLossesInConnectionWithCommercialization, us-gaap:NonUs, regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-03-31
Value-6-4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:ShareOfProfitLossesInConnectionWithCommercialization us-gaap:NonUs regn:SanofiCollaborationAgreementImmunooncology100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value18282169204819331711192716631608151115821500147013181226122012121200109811379988698027256656256105974574394144273042311221021071121331051151039611790
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Sales Revenue Goods Net

Cost Of Goods And Services Sold

us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

regn:CollaborationandContractManufacturing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1381151108510873795545535760
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.65.35.44.46.33.84.83.53.03.43.94.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:CollaborationandContractManufacturing0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Product



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value78108115677043303569524642
Percentage of CostOfGoodsAndServicesSold56.994.0104.778.465.560.138.764.5151.499.480.269.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.35.05.73.54.12.31.92.24.63.33.12.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Product6.48.49.45.66.44.03.03.67.05.44.84.6

us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:SanofisShareofLibtayoU.S.GrossProfits, regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-03-31
Value2612
Percentage of CostOfGoodsAndServicesSold19.411.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.50.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:SanofisShareofLibtayoU.S.GrossProfits regn:SanofiCollaborationAgreementImmunooncology0.00.0

Cost Of Goods Sold

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value11281493130916181231120910369859441043940919888879857921871866745653586586543443439360299286225216209168161168153146138139132136118106
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.768.963.983.772.062.862.361.362.566.062.762.667.471.770.376.072.679.065.565.567.473.174.866.670.360.365.565.252.771.390.4136.9156.8155.9136.5109.6130.3120.5127.9140.7101.1118.1

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value583683663104864160155652949852752950950747954355947046142539034335133729428722418718015814713812912714312912512212411711810594
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.931.532.454.237.531.233.532.933.033.435.334.738.539.144.546.239.142.037.439.139.543.846.544.245.937.541.041.037.048.459.9104.9124.4132.8115.393.7115.2107.5113.5122.789.8104.7

us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:RegeneronsShareOfResearchAndDevelopmentExpenses, regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-03-31
Value167
Percentage of ResearchAndDevelopmentExpense2.91.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:RegeneronsShareOfResearchAndDevelopmentExpenses regn:SanofiCollaborationAgreementAntibody0.00.0

us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:RegeneronsShareOfResearchAndDevelopmentExpenses, us-gaap:NonUs, regn:BayerCollaborationAgreement



Period End2020-03-312019-03-31
Value84
Percentage of ResearchAndDevelopmentExpense1.40.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax regn:RegeneronsShareOfResearchAndDevelopmentExpenses us-gaap:NonUs regn:BayerCollaborationAgreement0.00.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value3675864194174104913693643304093063062963252702922892942091741581751491021089772774647583632242320151414171211
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.127.020.521.624.025.522.222.721.925.920.420.922.526.622.124.124.126.918.517.518.321.820.615.417.416.315.817.611.015.725.229.632.022.820.915.414.812.713.717.610.912.9

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value7006757383154807186266225675385595504303473622913292313923442832151822221852361581532028722-45-58-60-40-12-32-23-28-39-1-16
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.331.136.116.328.037.237.738.737.534.137.337.432.628.329.724.027.421.034.534.532.626.925.233.429.739.734.534.847.328.79.6-36.9-56.8-55.9-36.5-9.6-30.3-20.5-27.9-40.7-1.1-18.1

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value6678777666657312669101111111111111194432222100
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.30.40.40.40.40.50.40.40.40.40.40.60.30.20.30.70.81.31.51.92.02.52.72.73.74.87.73.93.83.31.82.12.02.01.80.50.0

Interest Expense Debt

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-2522037-8273-341640242111-199-2313
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.410.21.8-4.34.3-1.81.02.51.61.40.8-1.30.7-0.20.30.20.3

Income Loss From Continuing Operations Before Income Taxes Domestic

Income Loss From Continuing Operations Before Income Taxes Foreign

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value-3121430-9066-4183318155-241-5300-30-16-7-26-6-19-10-11-10-11-10-10-10-8-3-3-2-1-1-1-1-101
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.79.91.5-4.73.9-2.20.52.11.21.00.4-1.70.1-0.40.30.10.1-0.30.1-1.7-0.8-3.3-0.9-2.9-1.7-1.9-2.3-2.6-2.5-3.5-4.6-7.0-3.3-2.8-2.4-1.4-1.7-1.5-1.6-1.20.21.5

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-12-312012-06-302011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4497983185-144411041073811771381838810196164721821332009996110109846042-335000000000
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.44.54.81.65.0-7.52.56.57.124.111.89.413.97.28.37.913.76.616.113.423.112.413.316.617.614.113.29.8-81.00.0-0.50.5-0.8-0.20.00.00.00.0

Income Taxes Paid Net

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value59479667020647681859555546815040939525524325619716115519816571135102956814185981917512-63-61-43-33-26
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax32.536.732.710.727.842.535.834.531.09.527.326.919.419.821.016.313.514.217.516.68.216.914.114.410.923.818.722.444.924.95.3-61.5-56.8-38.4-31.8-22.9

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value624792669193461820594551477173388387248253264196165154210194761107992659614187984701917611-53-62-62-43-14-33-25-30-36-1-14
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.236.532.710.026.942.635.734.331.611.025.926.418.920.621.716.213.814.118.519.58.713.711.013.910.515.923.719.122.5113.544.825.25.0-43.5-60.6-58.0-38.7-10.9-32.0-22.0-29.5-37.7-0.9-16.6

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value624669193461594551478100799265987611-53-62-62-43-14-33-25-30-36-1
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.091.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.232.710.026.935.834.331.612.511.013.910.522.525.25.0-43.5-60.6-58.0-38.7-10.9-32.0-22.0-29.5-37.7-0.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Diluted

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value15757148051393913173128541173410805995193728764870181067817697368286204590456095182452641983871373934563260295126402378227520801660145713501323983104610741089942790741
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value3624371534343417341029772937276528052620264925852951252423362128213919541886118812271329118710871049998950884869835854862846837554568556561594419344
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.025.124.625.926.525.427.227.829.929.930.531.937.836.234.234.336.234.836.426.329.234.331.831.532.233.936.037.238.240.151.559.262.763.356.454.351.851.663.153.046.5

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value15757148051393913173128541173410805995193728764870181067817697368286204590456095182452641983871373934563260295126402378227520801660145713501323983104610741089942790741
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value121331108910504975594448757786871866567614460515520486644494491407637653654329633382971254225512368221119521690149314061245806594504485428478518527348371386396422410421459
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets77.074.975.474.173.574.672.872.270.170.169.568.162.263.865.865.763.865.263.673.770.865.768.268.567.866.164.062.861.859.948.540.837.336.743.645.748.248.436.947.00.053.50.00.00.00.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value0.00.00.00.00.00.00.00.00.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0110000.0108000.0106000.0102000.097000.095000.091000.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value-92116152-12-10-11-150-128522641-1-2-3-1-1-1-2-1-1-10-2-200013100
Percentage of StockholdersEquity-0.10.20.20.20.0-0.1-0.1-0.2-0.20.0-0.30.22.11.10.20.1-0.1-0.2-0.2-0.1-0.1-0.2-0.4-0.3-0.4-0.4-0.2-0.4-0.5-0.1-0.10.20.30.80.2-0.00.0
Percentage of Assets-0.10.10.10.10.0-0.1-0.1-0.1-0.20.0-0.20.21.30.70.10.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.1-0.1-0.2-0.1-0.2-0.2-0.0-0.00.00.10.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value5211442843884263416039113841371236113512302930992404242323422236204518821827182617631795177517601754164316301609157513791368135713361323131312941253
Percentage of StockholdersEquity43.039.941.843.744.144.748.851.755.057.268.184.894.695.098.9101.2104.8111.4122.4129.8141.6222.7298.6349.4361.3383.8341.1310.6298.5396.2368.7351.3336.9313.3319.8307.2272.8
Percentage of Assets33.129.931.532.432.433.335.537.338.540.143.555.362.164.867.868.669.371.376.880.284.8108.1121.8130.4132.6167.2155.7149.8144.6146.3173.10.0180.30.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value8004737965875918572552544433383932872946174885225514565-27-92-189-330-418-517-987-1178-1255-1267-1213-1151-1089-1045-1030-997-971-941-904-903-873-794
Percentage of StockholdersEquity66.066.562.760.760.660.056.453.450.148.039.323.310.05.72.8-1.2-4.7-11.2-22.2-29.7-41.5-122.5-198.3-249.1-260.9-283.4-240.9-210.2-198.1-296.2-268.6-251.5-237.2-214.1-220.1-207.2-172.9
Percentage of Assets50.849.847.344.944.544.841.038.635.133.625.115.26.63.91.9-0.8-3.1-7.2-13.9-18.4-24.9-59.5-80.9-93.0-95.7-123.5-110.0-101.4-96.0-109.4-126.10.0-127.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312011-12-31
Value-1073-739-488-441-444-396-396-353-316-316-316-306-169-43-4300000
Percentage of StockholdersEquity-8.9-6.7-4.6-4.5-4.7-4.5-5.0-4.9-4.8-5.1-7.1-8.4-6.7-1.7-1.90.00.00.00.00.0
Percentage of Assets-6.8-5.0-3.5-3.4-3.5-3.4-3.7-3.6-3.4-3.6-4.5-5.5-4.4-1.2-1.30.00.00.00.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value864476897109665169286447571948144544433541353860366931803501320931332915267522832310216722001918187117961634156113071206948769696652339413325357575417425
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets54.951.951.050.553.954.952.948.448.549.547.547.646.945.651.351.753.152.051.650.455.056.058.855.557.460.961.965.757.458.057.152.851.649.334.639.530.332.861.152.857.4

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value22081617138410451708146710879171019812792744811535920646604809654390507648646600461535263381180230118171394483206254135112325112117207250271247498
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets14.010.99.97.913.312.510.19.210.99.39.19.210.47.713.510.410.214.412.68.612.116.817.317.414.218.110.016.07.911.17.211.829.236.521.024.312.610.334.514.20.027.90.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value2063210020271920172817231665153415311538153214201339134313321431145011521088107110157396736648017878557677035935063491592832313342
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.114.214.514.613.414.715.415.416.317.617.617.517.119.319.523.124.620.521.023.724.219.118.019.224.626.732.432.330.928.530.524.011.82.10.40.30.41.20.30.50.4

Inventory Net

us-gaap:InventoryNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value1480141513441317120811511039928820726641554466399345316303238190171133128120109867063574328291063
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.49.69.610.09.49.89.69.38.88.37.46.86.05.75.15.15.14.33.73.83.23.33.23.22.72.42.42.41.91.41.80.70.50.3

Inventory Finished Goods

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value226387226208182243284163155224143193146130103961151638943347161605296156108975684322622151915
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.42.61.61.61.42.12.61.61.72.61.72.41.91.91.51.52.02.91.71.00.81.81.71.81.63.35.94.64.32.75.12.21.91.71.61.81.4

Land

Property Plant And Equipment Gross

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value294428902771267626122575252424612394235822742261227720831872177216661594147513261110974818707600526453419392379372372369367363361357347318292259
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.719.519.920.320.322.023.424.725.626.926.127.929.129.927.428.628.228.428.529.326.525.221.920.518.417.917.217.617.218.322.525.527.427.837.034.633.331.933.837.035.0

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1611441371391441271258578773636372020655444338554152023181920191312106667
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.01.01.11.11.11.20.90.80.90.40.50.50.30.30.10.10.10.10.10.10.10.10.30.20.20.20.60.91.11.11.31.51.41.31.21.00.60.70.81.0

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value2055209617651713151114421417133112651135113810291308124196195191981173460153665441035130529826820319716317818316014813313511210913311993
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.014.212.713.011.812.313.113.413.513.013.112.716.717.814.115.315.614.514.213.312.816.911.010.29.410.110.28.68.77.910.812.611.911.213.613.010.410.014.215.112.6

Accounts Payable Current

Accounts Payable And Accrued Liabilities Current

Other Accrued Liabilities Current

Taxes Payable Current

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-03-312019-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value858500003331313222960
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.00.00.00.00.00.10.10.20.20.00.10.12.50.0

Long Term Debt

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value321286273267376361194190169152125115106100135119120115777655402314111110108767767677543
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.01.92.02.02.93.11.81.91.81.71.41.41.41.42.01.92.02.11.51.71.31.10.60.40.40.40.40.40.40.30.40.50.60.50.80.70.70.70.60.50.5

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:SanofiCollaborationAgreement



Period End2020-03-312019-12-31
Value450482
Percentage of OtherLiabilitiesNoncurrent140.1168.5
Percentage of Assets2.93.3
Percentage of Assets regn:SanofiCollaborationAgreement0.00.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value121331108910504975594448757786871866567614460515520486644494491407637653654329633382971254225512368221119521690149314061245806594504485428478518527348371386396422410421459
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets77.074.975.474.173.574.672.872.270.170.169.568.162.263.865.865.763.865.263.673.770.865.768.268.567.866.164.062.861.859.948.540.837.336.743.645.748.248.436.947.00.053.50.00.00.00.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-03-312010-12-312010-03-312009-12-312008-12-312007-12-31
Value0.00.00.00.00.00.00.00.00.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0100000.0110000.0108000.0106000.0102000.097000.095000.091000.0
Percentage of StockholdersEquity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value-92116152-12-10-11-150-128522641-1-2-3-1-1-1-2-1-1-10-2-200013100
Percentage of StockholdersEquity-0.10.20.20.20.0-0.1-0.1-0.2-0.20.0-0.30.22.11.10.20.1-0.1-0.2-0.2-0.1-0.1-0.2-0.4-0.3-0.4-0.4-0.2-0.4-0.5-0.1-0.10.20.30.80.2-0.00.0
Percentage of Assets-0.10.10.10.10.0-0.1-0.1-0.1-0.20.0-0.20.21.30.70.10.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.1-0.1-0.2-0.1-0.2-0.2-0.0-0.00.00.10.00.00.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value5211442843884263416039113841371236113512302930992404242323422236204518821827182617631795177517601754164316301609157513791368135713361323131312941253
Percentage of StockholdersEquity43.039.941.843.744.144.748.851.755.057.268.184.894.695.098.9101.2104.8111.4122.4129.8141.6222.7298.6349.4361.3383.8341.1310.6298.5396.2368.7351.3336.9313.3319.8307.2272.8
Percentage of Assets33.129.931.532.432.433.335.537.338.540.143.555.362.164.867.868.669.371.376.880.284.8108.1121.8130.4132.6167.2155.7149.8144.6146.3173.10.0180.30.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value8004737965875918572552544433383932872946174885225514565-27-92-189-330-418-517-987-1178-1255-1267-1213-1151-1089-1045-1030-997-971-941-904-903-873-794
Percentage of StockholdersEquity66.066.562.760.760.660.056.453.450.148.039.323.310.05.72.8-1.2-4.7-11.2-22.2-29.7-41.5-122.5-198.3-249.1-260.9-283.4-240.9-210.2-198.1-296.2-268.6-251.5-237.2-214.1-220.1-207.2-172.9
Percentage of Assets50.849.847.344.944.544.841.038.635.133.625.115.26.63.91.9-0.8-3.1-7.2-13.9-18.4-24.9-59.5-80.9-93.0-95.7-123.5-110.0-101.4-96.0-109.4-126.10.0-127.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312011-12-31
Value-1073-739-488-441-444-396-396-353-316-316-316-306-169-43-4300000
Percentage of StockholdersEquity-8.9-6.7-4.6-4.5-4.7-4.5-5.0-4.9-4.8-5.1-7.1-8.4-6.7-1.7-1.90.00.00.00.00.0
Percentage of Assets-6.8-5.0-3.5-3.4-3.5-3.4-3.7-3.6-3.4-3.6-4.5-5.5-4.4-1.2-1.30.00.00.00.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:StatementClassOfStock

us-gaap:CommonStockValue

us-gaap:CommonClassA



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value0.00.00.00.00.00.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.02000.0
Percentage of CommonStockValue0.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value100000.0100000.0100000.0100000.0100000.0100000.0110000.0110000.0110000.0110000.0109000.0109000.0108000.0108000.0107000.0107000.0107000.0106000.0106000.0105000.0103000.0102000.0100000.0100000.099000.097000.097000.097000.095000.095000.091000.0
Percentage of CommonStockValue0.00.00.00.00.00.05500.05500.05500.05500.05450.05450.05400.05400.05350.05350.05350.05300.05300.05250.05150.05100.05000.05000.04950.04850.04850.04850.04750.04750.04550.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value8004737965875918572552544433383932872946277323841997174814951230101885269748729225514565-27-92-189-330-418-517-987-1178-1255-1267-1213-1151-1089-1045-1030-997-941
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.849.847.344.944.544.841.038.635.133.631.929.425.525.121.919.817.215.213.510.87.06.63.91.9-0.8-3.1-7.2-13.9-18.4-24.9-59.5-80.9-93.0-95.7-123.5-110.0-101.4-96.0-109.4-126.1-127.0

Treasury Stock Value

us-gaap:TreasuryStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value1073739488441444396396353316316316316316316316316307306288287181-16943-430
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets6.85.03.53.43.53.43.73.63.43.63.63.94.04.54.65.15.25.55.66.34.3-4.41.2-1.30.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value-92116152-12-10-11-150232-5-12-254871947522641-1-2-3-1-1-1-2-1-1-10-2-2001
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.10.10.10.10.0-0.1-0.1-0.1-0.20.00.30.0-0.1-0.2-0.00.10.10.20.10.41.11.30.70.10.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.1-0.1-0.2-0.1-0.2-0.2-0.0-0.00.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value698787557188897728452394618566414-3035537765141529281892243-871981633275386-78-87-50-46-34-10-41160-13-9-46-9
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.236.327.29.752.437.827.224.540.935.827.6-2.127.030.853.434.22.425.778.524.4-10.124.722.549.28.619.6-25.7-37.6-40.9-45.4-31.6-9.4-31.2151.6-11.3-9.3-47.9-8.4

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-443-208-207-836-776-265-286-484-425-335-358-170-140-271-405-326-43-123-283-371-12956-123-118-236-147-13915-33014220-353515-136-19-13
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-24.2-9.6-10.1-43.2-45.3-13.8-17.2-30.2-28.1-21.2-23.9-11.6-10.6-22.1-33.3-26.9-3.6-11.2-24.9-37.2-14.97.1-17.0-17.7-37.8-33.6-45.76.8-27.6-0.9132.618.1-264.748.14.3-131.7-19.8-11.5

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value335-345-11-15119-833-1113-210-813360-49128-46-190-4-3451076-2525-7110811-5-17361010131821256222
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.4-15.9-0.5-0.87.0-4.30.2-0.70.9-13.3-0.59.14.6-40.12.4-3.9-15.9-0.4-30.41.18.8-31.50.8-10.717.42.6-1.7-7.7293.9-0.39.311.6136.71.52.354.323.11.8

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value698787557188897728452394618566414-3035537765141529281892243-871981633275386-78-87-50-46-34-10-41160-13-9-46-9
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.236.327.29.752.437.827.224.540.935.827.6-2.127.030.853.434.22.425.778.524.4-10.124.722.549.28.619.6-25.7-37.6-40.9-45.4-31.6-9.4-31.2151.6-11.3-9.3-47.9-8.4

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value624792669193461820594551477173388387248253264196165154210194761107992659614187984701917611-53-62-62-43-14-33-25-30-36-1-14
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.236.532.710.026.942.635.734.331.611.025.926.418.920.621.716.213.814.118.519.58.713.711.013.910.515.923.719.122.5113.544.825.25.0-43.5-60.6-58.0-38.7-10.9-32.0-22.0-29.5-37.7-0.9-16.6

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value624669193461594551478100799265987611-53-62-62-43-14-33-25-30-36-1
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.091.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax34.232.710.026.935.834.331.612.511.013.910.522.525.25.0-43.5-60.6-58.0-38.7-10.9-32.0-22.0-29.5-37.7-0.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value565452525142353336343735382827252222201516141413119987876644443
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value7010859109581069993887884816950261062303143591321151151317
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-443-208-207-836-776-265-286-484-425-335-358-170-140-271-405-326-43-123-283-371-12956-123-118-236-147-13915-33014220-353515-136-19-13
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-24.2-9.6-10.1-43.2-45.3-13.8-17.2-30.2-28.1-21.2-23.9-11.6-10.6-22.1-33.3-26.9-3.6-11.2-24.9-37.2-14.97.1-17.0-17.7-37.8-33.6-45.76.8-27.6-0.9132.618.1-264.748.14.3-131.7-19.8-11.5

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value335-345-11-15119-833-1113-210-813360-49128-46-190-4-3451076-2525-7110811-5-17361010131821256222
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.4-15.9-0.5-0.87.0-4.30.2-0.70.9-13.3-0.59.14.6-40.12.4-3.9-15.9-0.4-30.41.18.8-31.50.8-10.717.42.6-1.7-7.7293.9-0.39.311.6136.71.52.354.323.11.8

Repayments Of Long Term Debt

Payments For Repurchase Of Common Stock

us-gaap:PaymentsForRepurchaseOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3202461901004000
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.00.0100.0100.0100.00.00.00.0

Repayments Of Long Term Debt

Debt Instrument Interest Rate Stated Percentage

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value0.066-0.011000000000000010.1290.1410.156-0.092000000000000010.0650.160.1830.095999999999999970.3130.2630.424-0.0229999999999999650.2760.3290.498-0.037000000000000030.4650.4070.725-0.0199999999999999070.5470.5430.6270.3740.4080.303
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1051331171051071261111068212712512113315413113114215810294103816864815319231513121413888
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value22201630139710581721148011009301031825804756824547809
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:ReimbursementOfOtherExpenses

regn:Other, us-gaap:NonUs, regn:BayerCollaborationAgreement



Period End2020-03-312019-03-31
Value18
Percentage of ReimbursementOfOtherExpenses100.0100.0

us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:ReimbursementOfResearchAndDevelopmentExpense

regn:ReimbursementOfResearchAndDevelopmentExpenses, regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-03-31
Value7774
Percentage of ReimbursementOfResearchAndDevelopmentExpense100.0100.0

regn:ReimbursementOfResearchAndDevelopmentExpenses, regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-03-31
Value3946
Percentage of ReimbursementOfResearchAndDevelopmentExpense51.462.3

regn:ReimbursementOfResearchAndDevelopmentExpenses, regn:TevaPharmaceuticalsCollaborationAgreement



Period End2020-03-312019-03-31
Value2532
Percentage of ReimbursementOfResearchAndDevelopmentExpense32.543.2

us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:ReimbursementOfResearchAndDevelopmentExpenses, us-gaap:NonUs, regn:BayerCollaborationAgreement



Period End2020-03-312019-03-31
Value122
Percentage of ReimbursementOfResearchAndDevelopmentExpense15.53.5

us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:ReimbursementOfSellingGeneralAndAdministrativeExpense

regn:ReimbursementOfCommercializationRelatedExpenses, regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-03-31
Value91116
Percentage of ReimbursementOfSellingGeneralAndAdministrativeExpense100.0100.0

regn:ReimbursementOfCommercializationRelatedExpenses, regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-03-31
Value102
Percentage of ReimbursementOfSellingGeneralAndAdministrativeExpense11.41.9

us-gaap:Range, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:RevenuebasedonpercentageofannualsalesinJapan

srt:Maximum, regn:BayerCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.40.00.00.00.4
Percentage of RevenuebasedonpercentageofannualsalesinJapan100.00.00.00.0100.0

srt:Minimum, regn:BayerCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.3350.00.00.00.335
Percentage of RevenuebasedonpercentageofannualsalesinJapan83.80.00.00.083.8

us-gaap:StatementEquityComponents

regn:StockIssuedDistributedDuringPeriodSharesEmployeeBenefitPlan

us-gaap:TreasuryStock



Period End2020-03-312019-03-31
Value0.0100000.0
Percentage of StockIssuedDistributedDuringPeriodSharesEmployeeBenefitPlan0.0100.0

regn:StockIssuedDistributedDuringPeriodValueEmployeeBenefitPlan



Period End2020-03-312019-09-302019-06-302019-03-312018-03-31
Value14611100
Percentage of StockIssuedDistributedDuringPeriodValueEmployeeBenefitPlan100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-03-31
Value123940
Percentage of StockIssuedDistributedDuringPeriodValueEmployeeBenefitPlan85.665.079.541.0100.0

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-06-302019-03-31
Value2226
Percentage of StockIssuedDistributedDuringPeriodValueEmployeeBenefitPlan14.435.020.559.0

us-gaap:AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-31
Value1550291045319111016331249
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-31
Value1550291045319111016331249
Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-03-31
Value108112109114116113858274728253192312148
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-03-31
Value108112109114116113858274728253192312148
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value73-4-112-4435-91-141-15614039326-418106124386203-13612668248-1638883235-11-12-155-983152832-271941220-9-8
Percentage of AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value101818121414144711777033133013
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value590233339-663240379169
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0

us-gaap:MajorCustomers, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

regn:BesseMedical, regn:GrossSalesRevenue, us-gaap:CustomerConcentrationRisk



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value0.540.570.560.590.570.560.550.510.5
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0100.0100.0100.0

regn:McKessonCorporation, regn:GrossSalesRevenue, us-gaap:CustomerConcentrationRisk



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value0.360.340.340.310.360.350.40.290.29
Percentage of ConcentrationRiskPercentage166.759.660.752.563.262.572.756.958.0

us-gaap:EquitySecuritiesFvNiUnrealizedGainLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value-5617615-11642-624169-24275
Percentage of EquitySecuritiesFvNiUnrealizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6688897682245466766356565855545655254323413652923302273933272761891762031752251471411917611-54-61-63-43-14-33-25-30
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-853249129-1930112-9765118-334187146-26301031393510325855930-1432201214-32513-2010512-54
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value169122041501064016395-30212694137-32-108-1133972844973219033-1539210919713535-6-3-410-12236-27
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value73-81-25-25426-16554-29-54-53-48
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInDeferredIncomeTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-920-15114101061896-42750164016927827955648103215135
Percentage of IncreaseDecreaseInDeferredIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-701512126-69-321479-6885-4856201122-17-3966472-358082043640-110-20-1-4240
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AwardType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:EmployeeStockOption



Period End2020-03-312019-03-31
Value56
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0

us-gaap:RestrictedStock



Period End2020-03-312019-03-31
Value300000.0100000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements6.01.5

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax



Period End2020-03-312019-09-302019-06-302019-03-31
Value-10-1-1
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-300131514-9
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-300131514-9
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-28411416003-11-232186-9-80-40-11-28-42522220-100-100010-20-10-22
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-31
Value-82142-2-13423-9427504-19-6-33-3-31-5-3-30-15-11-6-17-6-2-3-7-7-500
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:OtherOperatingIncome

regn:AmountsRecognizedInConnectionWithUpFrontPayments, regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-03-31
Value1626
Percentage of OtherOperatingIncome100.0100.0

regn:AmountsRecognizedInConnectionWithUpFrontPayments, regn:TevaPharmaceuticalsCollaborationAgreement



Period End2020-03-312019-03-31
Value1621
Percentage of OtherOperatingIncome100.681.7

us-gaap:OtherOperatingIncomeExpenseNet



Period End2020-03-312019-03-31
Value4056
Percentage of OtherOperatingIncomeExpenseNet100.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-31
Value15514702910110453102234631096143188351421911101633124931
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireMarketableSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value7143676451148104031135257960139340626820820337722806209245958510312025318022248124990153631944177985
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireProductiveAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value170139121947485106112791075954501501181381041771462391141177970642112111181422322222222222
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value81148814140275320131338172163626243955343976451785512731-50101318312932
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfMarketableSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value4412975604073381311812062551651071531198289416061721138025960738254967510110715858469273631294
Percentage of ProceedsFromSaleAndMaturityOfMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock



Period End2020-03-312019-03-31
Value30
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value817140003000200
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.00.00.0100.00.00.00.0100.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value817140003000200
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.00.00.0100.00.00.00.0100.00.00.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:TreasuryStockSharesAcquired

regn:DupilumabREGN3500EligibleInvestments



Period End2020-03-312019-03-31
Value85287.024143.0
Percentage of TreasuryStockSharesAcquired100.0100.0

regn:LibtayoDevelopment



Period End2020-03-312019-03-31
Value43627.0106972.0
Percentage of TreasuryStockSharesAcquired51.2443.1

us-gaap:ShareRepurchaseProgram

regn:ShareRepurchaseProgram



Period End2020-03-31
Value719167.0
Percentage of TreasuryStockSharesAcquired843.2

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-03-312018-09-302018-06-302014-12-312014-09-30
Value0000010
Percentage of TreasuryStockSharesAcquired938.00.0414.20.00.00.00.0

us-gaap:TreasuryStockValueAcquiredCostMethod



Period End2020-03-312019-09-302019-03-312018-09-302018-06-302014-12-312014-09-30
Value3364854423700
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.00.00.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:DupilumabREGN3500EligibleInvestments



Period End2020-03-312019-03-31
Value4110
Percentage of TreasuryStockValueAcquiredCostMethod12.418.5

regn:LibtayoDevelopment



Period End2020-03-312019-03-31
Value2144
Percentage of TreasuryStockValueAcquiredCostMethod6.481.5

us-gaap:ShareRepurchaseProgram

regn:ShareRepurchaseProgram



Period End2020-03-31
Value272
Percentage of TreasuryStockValueAcquiredCostMethod81.2

us-gaap:StatementEquityComponents

us-gaap:TreasuryStock



Period End2020-03-312019-09-302019-03-312018-09-302018-06-302014-12-312014-09-30
Value336485442371250
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0100.0100.00.00.0

us-gaap:StatementClassOfStock

dei:EntityCommonStockSharesOutstanding

us-gaap:CommonClassA



Period End2020-04-142020-01-312019-10-242019-07-222019-04-172019-01-312018-10-192018-07-202018-04-122018-02-012017-10-202017-07-202017-04-132017-02-012016-10-202016-07-142016-04-142016-02-042015-10-162015-07-172015-04-162015-02-052014-10-162014-07-172014-04-172014-02-062013-10-282013-07-172013-04-172013-02-072012-10-122012-07-132012-04-112012-02-102011-10-19
Value11111111111111111111111122222222222
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock



Period End2020-04-142020-01-312019-10-242019-07-222019-04-172019-01-312018-10-192018-07-202018-04-122018-02-012017-10-202017-07-202017-04-132017-02-012016-10-202016-07-142016-04-142016-02-042015-10-162015-07-172015-04-162015-02-052014-10-162014-07-172014-04-172014-02-062013-10-282013-07-172013-04-172013-02-072012-10-12
Value110108107107107107106106105105105105104104103103103102102101101100999998979796959594
Percentage of EntityCommonStockSharesOutstanding5985.75850.35838.25840.25636.25617.35562.75553.45543.25534.65520.85505.85460.75449.75417.85408.65392.55375.55337.75212.35137.55104.05051.95006.84942.14845.84800.24743.24660.14609.84521.2

regn:AccruedCapitalExpenditures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value7213310074545440384041243032283339445084678456383517161881087556435101249
Percentage of AccruedCapitalExpenditures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:Maximumsharesthecollaboratorcouldsell

regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-01-01
Value0101111
Percentage of Maximumsharesthecollaboratorcouldsell100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:UnsatisfiedObligation

regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-31
Value1087
Percentage of UnsatisfiedObligation100.0

regn:TevaPharmaceuticalsCollaborationAgreement



Period End2020-03-31
Value225
Percentage of UnsatisfiedObligation20.7

us-gaap:AccountsAndNotesReceivableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value40131128628328929326726124324222120319517518718124016215112516315614211212763
Percentage of AccountsAndNotesReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:BayerCollaborationAgreement



Period End2020-03-312019-12-31
Value279311
Percentage of AccountsAndNotesReceivableNet69.7100.0

regn:TevaPharmaceuticalsCollaborationAgreement



Period End2020-03-312019-12-31
Value2221
Percentage of AccountsAndNotesReceivableNet5.66.8

us-gaap:AccountsPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value347418335244239218172171207178
Percentage of AccountsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsReceivableRelatedPartiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value46826034525228722626924316819321722121492124138173153199197159121110116118104
Percentage of AccountsReceivableRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value458272332248264138187160121
Percentage of AccountsReceivableRelatedPartiesCurrent97.9104.696.398.791.961.069.766.262.5

regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value-2-1681877757659
Percentage of AccountsReceivableRelatedPartiesCurrent-0.5-6.42.46.534.428.131.530.6

us-gaap:AccruedLiabilitiesAndOtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value11431086821876741772781670666637
Percentage of AccruedLiabilitiesAndOtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value52114428438842634160391138413712361135123570344931903029331431563049309928803118281224042423234222362045188218271826176317951775176017541643163016091575137913681336
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value2328272391222
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:CertificatesOfDeposit, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value100000.0100000.0100000.0100000.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.40.40.40.40.0

us-gaap:CommercialPaper, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value100000.00.00.0100000.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax0.40.00.00.40.0

us-gaap:CorporateBondSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value202727221
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax88.197.597.196.1100.0

us-gaap:SovereignDebtSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value10000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax5.11.41.82.20.0

us-gaap:USTreasuryAndGovernment, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value10000
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax6.00.70.70.90.0

us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3100161819208
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:CertificatesOfDeposit, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value300000.00.00.00.00.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.90.00.00.00.0

us-gaap:CorporateBondSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value3100117
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax99.166.785.789.594.6

us-gaap:USTreasuryAndGovernment, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.0100000.0100000.0200000.01000000.0
Percentage of AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax0.033.314.310.55.4

us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value447842064148407337303026285127432027
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:CertificatesOfDeposit, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value7772665360
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.71.71.61.32.0

us-gaap:CommercialPaper, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1629210899113
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis3.62.22.62.43.8

us-gaap:CorporateBondSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value41283960388037742734
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis92.294.293.592.690.4

us-gaap:SovereignDebtSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value362626267
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis0.80.60.60.70.3

us-gaap:USTreasuryAndGovernment, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value735465119110
Percentage of AvailableForSaleDebtSecuritiesAmortizedCostBasis1.61.31.62.93.6

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value267426382682247022091667172919591752142612391004898815759572533600653542392360496538525383
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value1795159614931624152313421104765605593586523495503443345244236241213234251287216186158
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value446942344176409437333009283427242358202018261527140813181203917778836894757627613789760717547509326479351461422296322301310510
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value77726653696011
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.71.61.31.92.00.5

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1629210899152113107
Percentage of AvailableForSaleSecuritiesDebtSecurities3.62.22.62.44.13.85.3

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value4117398839073794335527181712
Percentage of AvailableForSaleSecuritiesDebtSecurities92.194.293.692.789.990.384.8

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:SovereignDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value37272727277
Percentage of AvailableForSaleSecuritiesDebtSecurities0.80.60.70.70.70.3

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value755466119129109185
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.31.62.93.53.69.2

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:CertificatesOfDeposit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value77726653696011
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.71.61.31.92.00.5

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1629210899152113107
Percentage of AvailableForSaleSecuritiesDebtSecurities3.62.22.62.44.13.85.3

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value4117398839073794335527181712
Percentage of AvailableForSaleSecuritiesDebtSecurities92.194.293.692.789.990.384.8

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:SovereignDebtSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value37272727277
Percentage of AvailableForSaleSecuritiesDebtSecurities0.80.60.70.70.70.3

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:USTreasuryAndGovernment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value755466119129109185
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.31.62.93.53.69.2

us-gaap:FinancialInstrument, regn:ClassificationOfInvestment

us-gaap:CertificatesOfDeposit, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value7772665360
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.71.61.32.0

us-gaap:CommercialPaper, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value1629210899113
Percentage of AvailableForSaleSecuritiesDebtSecurities3.62.22.62.43.8

us-gaap:CorporateBondSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value41173988390737942718
Percentage of AvailableForSaleSecuritiesDebtSecurities92.194.293.692.790.3

us-gaap:SovereignDebtSecurities, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value372727277
Percentage of AvailableForSaleSecuritiesDebtSecurities0.80.60.70.70.3

us-gaap:USTreasuryAndGovernment, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value755466119109
Percentage of AvailableForSaleSecuritiesDebtSecurities1.71.31.62.93.6

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:ContractWithCustomerLiability

regn:BayerCollaborationAgreement



Period End2020-03-312019-12-31
Value124123
Percentage of ContractWithCustomerLiability100.0100.0

regn:SanofiCollaborationAgreementAntibody



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value401337377339302236199170117
Percentage of ContractWithCustomerLiability323.2274.10.00.00.00.00.00.00.0

regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value12568602629665289468476440
Percentage of ContractWithCustomerLiability10.3461.80.00.00.00.00.00.00.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:ContractWithCustomerLiabilityCurrent

regn:OtherCollaborationAgreements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value8171181168196205216180142
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

regn:SanofiCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value398395427424334246246308177
Percentage of ContractWithCustomerLiabilityCurrent490.1552.4235.2252.4169.9119.9114.2170.8124.8

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:ContractWithCustomerLiabilityNoncurrent

regn:OtherCollaborationAgreements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value6577131181178184197199249
Percentage of ContractWithCustomerLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

regn:SanofiCollaborationAgreement



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value16509551544633279421339379
Percentage of ContractWithCustomerLiabilityNoncurrent24.6656.8418.4300.3354.4151.1213.1170.0152.4

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0432356411033900503289326
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.0

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value041216564941801406218256
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger0.095.491.788.191.189.080.875.278.6

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0001612843
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value0.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.0

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0001611732
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss0.00.0100.088.290.991.984.480.876.7

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value20392743133125171482142516361044
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value49
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months2.4

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1990257294312313148214171588930
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months97.693.794.1100.060.6100.099.597.189.2

us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value310000611155
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value300000.0
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss0.9

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value310000610154
Percentage of DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss99.166.775.0100.0100.0100.098.295.892.2

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPosition



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value203931754995315502383192819261370
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value49
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition2.4

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value199029851187712542284182418061187
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPosition97.693.993.192.080.995.894.693.886.6

us-gaap:DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3100161819208
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancialInstrument

us-gaap:CertificatesOfDeposit



Period End2020-03-31
Value300000.0
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss0.9

us-gaap:CorporateBondSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value3100161718187
Percentage of DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss99.166.785.789.591.394.692.292.286.0

us-gaap:DeferredIncomeTaxAssetsNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value771824808821829828562545506
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, regn:ClassificationOfInvestment

us-gaap:EquitySecuritiesFvNi

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, regn:Restricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value51055749620
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.00.0

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5161466743
Percentage of EquitySecuritiesFvNi10.111.195.1107.70.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, regn:Restricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0033328444
Percentage of EquitySecuritiesFvNi0.00.0676.5457.90.0

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, regn:ClassificationOfInvestment

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, regn:Restricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value51055738234744
Percentage of EquitySecuritiesFvNi100.0100.0776.5557.90.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, regn:Unrestricted



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5161466743
Percentage of EquitySecuritiesFvNi10.111.195.1107.70.0

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value5555434545
Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-30
Value715713712711
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value9670493430242826222123332013161414111291110111213141210621
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value2102162292292322262162052011901871701279289738559342091010106955644
Percentage of InventoryRawMaterialsNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value692727633663581571435400374302217162173202164165157132110111837370604735343425148
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossContingencyAccrualAtCarryingValue



Period End2020-03-312019-12-312018-12-31
Value11710030
Percentage of LossContingencyAccrualAtCarryingValue100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency

us-gaap:MarketableSecurities

us-gaap:FairValueInputsLevel1, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-31
Value5626189612912243906962
Percentage of MarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-31
Value446942344509437937403053288723582020
Percentage of MarketableSecurities795.3684.34687.63389.83043.87003.73192.53414.23218.2

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-12-31
Value503148534605450838633097297724272083
Percentage of MarketableSecurities895.3784.34787.63489.83143.87103.73292.53514.23318.2

us-gaap:MarketableSecuritiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1795159614931624152313421104765605596586523495503488398244236241213234251395216186158182155127771431293743395591136153194134
Percentage of MarketableSecuritiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MarketableSecuritiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value323632563112288423391755187320441821148613271064967864777589555632681589483460453550534389329173346271312288254275258251373370377047
Percentage of MarketableSecuritiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherInventoryNetOfReserves



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value48140043239036432835829522121221318814591746145363229283327271811106661
Percentage of OtherInventoryNetOfReserves100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

us-gaap:OtherLiabilities

regn:SanofiCollaborationAgreementImmunooncology



Period End2020-03-312019-12-31
Value527558
Percentage of OtherLiabilities100.0100.0

regn:TevaPharmaceuticalsCollaborationAgreement



Period End2020-03-312019-12-31
Value97114
Percentage of OtherLiabilities18.620.5

us-gaap:PreferredStockSharesAuthorized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value3030303030303030303030303030303030303030303030303030303030303030000300003030303030303030
Percentage of PreferredStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PreferredStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312012-06-302011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.02000.00.00.00.0
Percentage of PreferredStockValue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:TreasuryStockShares



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value5444433333333333333322000
Percentage of TreasuryStockShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

Line plots across dimensions of each concept

us-gaap:CommonStockValue us-gaap:StatementClassOfStock


us-gaap:SharesOutstanding us-gaap:StatementClassOfStock


us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock


us-gaap:CommonStockSharesAuthorized us-gaap:StatementClassOfStock


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject


us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementClassOfStock


us-gaap:StockholdersEquity us-gaap:StatementEquityComponents


us-gaap:StockholdersEquity us-gaap:StatementClassOfStock


us-gaap:CommonStockValue us-gaap:StatementClassOfStock