Stockholders' Equity and Equity-Based Incentive Plans - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ (2,143)	$ 823
Net current period other comprehensive income		(74)	(58)
Ending Balance		(3,595)	675
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(97)	(73)
Other comprehensive income before reclassification		(32)	(39)
Net current period other comprehensive income		(32)	(39)
Ending Balance		(129)	(112)
Net Unrealized Loss on Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[1]	(12)	(40)
Other comprehensive income before reclassification	[1]	(49)	(22)
Amounts reclassified from AOCI	[1],[2]	7	3
Net current period other comprehensive income	[1]	(42)	(19)
Ending Balance	[1]	(54)	(59)
Defined Benefit Pension and Other Postretirement Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		6	6
Ending Balance		6	6
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(103)	(107)
Other comprehensive income before reclassification		(81)	(61)
Amounts reclassified from AOCI	[2]	7	3
Net current period other comprehensive income		(74)	(58)
Ending Balance		$ (177)	$ (165)

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

[2] Amounts are net of tax, which was not material during the three months ended March 31, 2020 and 2019.