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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value at the beginning of the period $ (497)
Revaluation of debt securities 3
Fair value at the end of the period (392)
Actavis Generics [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Actavis Generics transaction 106
Eagle Transaction [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Adjustments to provisions for contingent consideration (35)
Settlement of contingent consideration $ 31