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Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency hedges, assets at fair value $ 15 $ 23
Interest rate hedges, assets at fair value 4 7
Available-for-sale securities 8 9
Total assets 27 39
Foreign currency hedges, liabilities at fair value 4 3
Contingent payments related to acquisitions 9 19
Total liabilities 13 22
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 8 9
Total assets 8 9
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency hedges, assets at fair value 15 23
Interest rate hedges, assets at fair value 4 7
Total assets 19 30
Foreign currency hedges, liabilities at fair value 4 3
Total liabilities 4 3
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent payments related to acquisitions 9 19
Total liabilities $ 9 $ 19