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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 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)
Transfer into Level 3- equity securities 0 179
Revaluation of equity securities 0 80
Redemption of debt securities (9) 0
Revaluation of debt securities 0 (2)
Reclassification to Level 2- equity securities 0 (259)
Bifurcated embedded derivatives   0
Fair value at the end of the period (175) (258)
Actavis Generics [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Actavis Generics transaction 15 156
Eagle Transaction [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration (23) (75)
Settlement of contingent consideration $ 100 $ 111