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Contingencies - Fosamax Litigation - Narrative (Details) - Fosamax
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
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Mar. 31, 2018
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Dec. 31, 2014
USD ($)
Jul. 31, 2015
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Nov. 30, 2013
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Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   4,040      
ONJ Litigation          
Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   10      
Litigation settlement amount to other party | $     $ 27.3    
Percentage of participation in litigation settlement (as percent)     95.00%    
Femur Fracture Litigation          
Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   4,030      
Femur Fracture Litigation | Federal          
Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   540      
Loss contingency, claims dismissed, number (in legal matters) 650 510      
Loss contingency, claims on appeal, number (in legal matters)   515      
Femur Fracture Litigation | New Jersey state court          
Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   2,700      
Loss contingency, initial cases selected for review, number (in legal matters)   30      
Loss contingency, subsequent cases selected for review, number (in legal matters) 50     25 50
Femur Fracture Litigation | California state court          
Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   280      
Loss contingency, initial cases selected for review, number (in legal matters) 10        
Femur Fracture Litigation | Other state courts          
Loss Contingencies [Line Items]          
Loss contingency, pending claims, number (in legal matters)   4