Derivative Financial Instruments - Schedule of Fair Value by Underlying Risk and Balance Sheet Classification (Detail) - Cash Flow Hedging [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivatives not Designated as Hedges [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	$ 3
Total derivatives liability	3
Derivatives not Designated as Hedges [Member] | Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	3
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	4	$ 2
Total derivatives liability	18	1
Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	11	1
Other Current Assets [Member] | Derivatives not Designated as Hedges [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	3
Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	2	$ 2
Other Non-current Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	2
Other Non-current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	$ 7