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Contingencies and Environmental Liabilities - Fosamax Product Liability Litigation - Narrative (Details) - Fosamax - legalmatter
 1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2019
Loss Contingencies [Line Items]    
Loss contingency, pending claims number   3,750
Federal Court    
Loss Contingencies [Line Items]    
Loss contingency, pending claims number   970
Loss contingency, claims dismissed number 650  
Loss contingency, claims on appeal, number   515
New Jersey State Court    
Loss Contingencies [Line Items]    
Loss contingency, pending claims number   2,510
California State Court    
Loss Contingencies [Line Items]    
Loss contingency, pending claims number   275
Other State Court    
Loss Contingencies [Line Items]    
Loss contingency, pending claims number   4