Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Net income (loss)	$ (481,000,000)	$ 62,000,000	$ (639,000,000)	$ (29,000,000)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments (net of tax of $4, $4, $0, and $(2) respectively)	39,000,000	9,000,000	(44,000,000)	10,000,000
Net unrealized gain (loss) on cash flow hedges (net of tax of $3, $4, $9, and $7 respectively)	(8,000,000)	(13,000,000)	(26,000,000)	(21,000,000)
Minimum pension liability adjustment (net of tax of $0, $0, $0, and $0, respectively)	2,000,000	2,000,000	4,000,000	4,000,000
Other comprehensive income (loss)	33,000,000	(2,000,000)	(66,000,000)	(7,000,000)
Total comprehensive income (loss)	(448,000,000)	60,000,000	(705,000,000)	(36,000,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			2,000,000	(2,000,000)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	4,000,000	4,000,000	0	(2,000,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	3,000,000	4,000,000	9,000,000	7,000,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	0	0	0	0
Corporate Interest Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	2,000,000	1,000,000	1,000,000	3,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	1,000,000	1,000,000	1,000,000	2,000,000
Selling, General and Administrative Expenses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	2,000,000	2,000,000	4,000,000	4,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 2,000,000	$ 2,000,000	$ 3,000,000	$ 3,000,000