Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, assets at fair value	$ 26	$ 25
Interest Rate Fair Value Hedge Asset at Fair Value	1
Marketable equity securities	4	3
Total assets	31	28
Foreign currency hedges, liabilities at fair value	1	3
Interest rate contracts, liabilities at fair value	95	3
Contingent payments related to acquisitions	27	32
Total liabilities	123	38
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, assets at fair value	0	0
Interest Rate Fair Value Hedge Asset at Fair Value	0
Marketable equity securities	4
Total assets	4	3
Foreign currency hedges, liabilities at fair value	0	0
Interest rate contracts, liabilities at fair value	0	0
Contingent payments related to acquisitions	0	0
Total liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, assets at fair value	26	25
Interest Rate Fair Value Hedge Asset at Fair Value	1
Marketable equity securities	0	0
Total assets	27	25
Foreign currency hedges, liabilities at fair value	1	3
Interest rate contracts, liabilities at fair value	95	3
Contingent payments related to acquisitions	0	0
Total liabilities	96	6
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange contracts, assets at fair value	0	0
Interest Rate Fair Value Hedge Asset at Fair Value	0
Marketable equity securities	0	0
Total assets	0	0
Foreign currency hedges, liabilities at fair value	0	0
Interest rate contracts, liabilities at fair value	0	0
Contingent payments related to acquisitions	27	32
Total liabilities	$ 27	$ 32

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value as of the balance sheet date of all derivative assets designated as foreign currency fair value hedging instruments.

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Fair value of financial and nonfinancial obligations.

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