Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities	$ 7	$ 8
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency hedges, assets at fair value	11	15
Interest rate hedges, assets at fair value		4
Marketable equity securities	7	8
Total assets	18	27
Foreign currency hedges, liabilities at fair value	4	4
Contingent payments related to acquisitions	23	9
Total liabilities	27	13
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable equity securities	7	8
Total assets	7	8
Fair Value, Measurements, Recurring | 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	11	15
Interest rate hedges, assets at fair value		4
Total assets	11	19
Foreign currency hedges, liabilities at fair value	4	4
Total liabilities	4	4
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments related to acquisitions	23	9
Total liabilities	$ 23	$ 9