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