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Executive Stock Purchase Plan (Details) (Executive Stock Purchase Plan)
24 Months Ended
Dec. 31, 1990
Dec. 31, 2014
Dec. 31, 1989
Executive Stock Purchase Plan
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Number of shares of Class A Stock reserved for restricted stock awards (in shares)     1,027,500us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= regn_ExecutiveStockPurchasePlanMember
Number of shares issued (in shares) 983,254us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= regn_ExecutiveStockPurchasePlanMember
   
Number of shares available for future grants under the Plan (in shares)   44,246us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= regn_ExecutiveStockPurchasePlanMember