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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value at the beginning of the period $ (258) $ (448)
Transfer into Level 3- equity securities   179
Redemption of debt securities (9) 118
Revaluation of debt securities   (3)
Fair value at the end of the period (186) 27
Actavis Generics [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration 21 161
Eagle Transaction [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration (14) (65)
Settlement of contingent consideration $ 74 $ 85