Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) Reclassified (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 1,789	$ 1,595	$ 1,547
Acquisition of NCI			(8)	(18)
Net current period other comprehensive income		(56)	16	27
Ending Balance		823	1,789	1,595
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(49)	(42)
Other comprehensive income before reclassification		(24)	(1)
Amounts reclassified from AOCI	[1]		(6)
Net current period other comprehensive income		(24)	(7)
Ending Balance		(73)	(49)	(42)
Net Unrealized Loss on Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	[2]	(2)	(25)
Other comprehensive income before reclassification	[2]	(46)	16
Acquisition of NCI	[2]		(2)
Amounts reclassified from AOCI	[1],[2]	8	5
Net current period other comprehensive income	[2]	(38)	23
Ending Balance	[2]	(40)	(2)	(25)
Defined Benefit Pension and Other Postretirement Plans [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income before reclassification		6
Net current period other comprehensive income		6
Ending Balance		6
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(51)	(67)	(94)
Other comprehensive income before reclassification		(64)	15
Acquisition of NCI			(2)
Amounts reclassified from AOCI	[1]	8	(1)
Net current period other comprehensive income		(56)	16	27
Ending Balance		$ (107)	$ (51)	$ (67)

[1] Amounts are net of tax, which was not material in 2018 and 2017.

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