Classification and Fair Value Amounts of Derivative Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 11	$ 19
Derivative liability, fair value	4	4
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	11	18
Derivative liability, fair value	2	3
Designated as Hedging Instrument | Foreign exchange contract | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	11	14
Designated as Hedging Instrument | Foreign exchange contract | Accounts Payable And Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	2	3
Designated as Hedging Instrument | Interest rate contract | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		4
Not Designated as Hedging Instrument | Foreign exchange contract | Prepaid expenses and other
Derivatives, Fair Value [Line Items]
Derivative asset, fair value		1
Not Designated as Hedging Instrument | Foreign exchange contract | Accounts Payable And Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 2	$ 1