Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency hedges, assets at fair value	$ 13	$ 23
Interest rate hedges, assets at fair value	6	7
Available-for-sale securities	11	9
Total assets	30	39
Foreign currency hedges, liabilities at fair value	5	3
Contingent payments related to acquisitions	10	19
Total liabilities	15	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	11	9
Total assets	11	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	13	23
Interest rate hedges, assets at fair value	6	7
Total assets	19	30
Foreign currency hedges, liabilities at fair value	5	3
Total liabilities	5	3
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments related to acquisitions	10	19
Total liabilities	$ 10	$ 19