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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value at the beginning of the period $ (717)
Revaluation of debt securities 1
Fair value at the end of the period (703)
Actavis Generics Transaction [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Adjustments to provisions for contingent consideration (13)
Labrys Transaction [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Adjustments to provisions for contingent consideration (1)
Eagle Transaction [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Adjustments to provisions for contingent consideration (41)
Settlement of contingent consideration $ 68