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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value at the beginning of the period $ (258) $ (448)
Revaluation of debt securities (9)  
Fair value at the end of the period (245) (423)
Actavis Generics [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration   (5)
Actavis Generics transaction (3)  
Eagle Transaction [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration   (1)
Settlement of contingent consideration $ 25 $ 31