Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 823	$ 1,789	$ 1,595
Net current period other comprehensive (loss) income		4	(56)	16
Ending Balance		(2,143)	823	1,789
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(73)	(49)
Other comprehensive (loss) income before reclassification		(24)	(24)
Net current period other comprehensive (loss) income		(24)	(24)
Ending Balance		(97)	(73)	(49)
Net Unrealized Loss on Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(40)	(2)
Other comprehensive (loss) income before reclassification	[1]	(57)	(46)
Amounts reclassified from AOCI	[1],[2]	85	8
Net current period other comprehensive (loss) income	[1]	28	(38)
Ending Balance	[1]	(12)	(40)	(2)
Defined Benefit Pension and Other Postretirement Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		6
Other comprehensive (loss) income before reclassification			6
Net current period other comprehensive (loss) income			6
Ending Balance		6	6
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(107)	(51)	(67)
Other comprehensive (loss) income before reclassification		(81)	(64)
Amounts reclassified from AOCI	[2]	85	8
Net current period other comprehensive (loss) income		4	(56)	16
Ending Balance		$ (103)	$ (107)	$ (51)

[1] Refer to Note 17, Derivative Financial Instruments, for additional details.

[2] Amounts are net of tax, which was not material in 2019 and 2018.