Derivative Financial Instruments - Schedule of Fair Value by Underlying Risk and Balance Sheet Classification (Detail) - Cash Flow Hedging [Member] - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	$ 2	$ 3
Total derivatives liability	107	42
Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	41	10
Derivatives not Designated as Hedges [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	2	3
Total derivatives liability	3	3
Derivatives not Designated as Hedges [Member] | Accrued Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	2	3
Other Current Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	2	3
Other Current Assets [Member] | Derivatives not Designated as Hedges [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	1	3
Other Non-current Assets [Member] | Derivatives not Designated as Hedges [Member]
Derivatives Fair Value [Line Items]
Total derivatives asset	1
Other Non-current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	66	$ 32
Other Non-current Liabilities [Member] | Derivatives not Designated as Hedges [Member]
Derivatives Fair Value [Line Items]
Total derivatives liability	$ 1