Contingencies (Details) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2014 case	Mar. 31, 2019 USD ($)	Sep. 30, 2021 USD ($) case	Dec. 31, 2020 USD ($)	Dec. 31, 2018
Loss Contingencies [Line Items]
Amount of legal defense reserves | $			$ 8.0	$ 35.0
Fosamax
Loss Contingencies [Line Items]
Number of pending claims			3,470
Fosamax | Federal | Femur Fracture Litigation
Loss Contingencies [Line Items]
Number of pending claims			975
Number of claims dismissed	650
Number of claims on appeal	515
Fosamax | New Jersey State Court | Femur Fracture Litigation
Loss Contingencies [Line Items]
Number of pending claims			2,215
Fosamax | California State Court | Femur Fracture Litigation
Loss Contingencies [Line Items]
Number of pending claims			275
Fosamax | Other State Courts | Femur Fracture Litigation
Loss Contingencies [Line Items]
Number of pending claims			5
Propecia/ Proscar | U.S.
Loss Contingencies [Line Items]
Number of pending claims			3
Propecia/ Proscar | Outside the United States
Loss Contingencies [Line Items]
Number of pending claims			15
Number of pending class actions			2
Number of pending putative class actions			2
Propecia/ Proscar | New Jersey Coordinated Proceedings
Loss Contingencies [Line Items]
Amount awarded to other party | $		$ 4.3
Plaintiff participation percentage					95.00%
Plaintiff clawback participation rate percentage					100.00%
Nexplanon/Implanon NXT | Outside the United States
Loss Contingencies [Line Items]
Number of pending claims			21
Nexplanon | Outside the United States
Loss Contingencies [Line Items]
Number of pending claims			4
Implanon | Outside the United States
Loss Contingencies [Line Items]
Number of pending claims			17
Implanon | Northern District of Ohio
Loss Contingencies [Line Items]
Number of pending claims			2
Number of unfiled claims			56