Stockholders' Equity and Equity-Based Incentive Plans - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 823	$ 1,790
Net current period other comprehensive income		(58)	(1)
Ending Balance		675	1,839
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(73)	(49)
Other comprehensive income before reclassification		(39)	(1)
Net current period other comprehensive income		(39)	(1)
Ending Balance		(112)	(50)
Net Unrealized Loss on Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(40)	(1)
Other comprehensive income before reclassification	[1]	(22)
Amounts reclassified from AOCI	[1],[2]	3
Net current period other comprehensive income	[1]	(19)
Ending Balance	[1]	(59)	(1)
Defined Benefit Pension and Other Postretirement Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		6
Ending Balance		6
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(107)	(50)
Other comprehensive income before reclassification		(61)	(1)
Amounts reclassified from AOCI	[2]	3
Net current period other comprehensive income		(58)	(1)
Ending Balance		$ (165)	$ (51)

[1] Refer to Note 16, Derivative Financial Instruments, for additional details.

[2] Amounts are net of tax, which was not material in three months ended March 31, 2019 and 2018.