Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Net income (loss)	$ 45,000,000	$ 189,000,000	$ (594,000,000)	$ 160,000,000
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments (net of tax of $12, $(12), $12, and $(14), respectively)	35,000,000	(31,000,000)	(9,000,000)	(21,000,000)
Net unrealized gain (loss) on cash flow hedges (net of tax of $3, $2, $12, and $9, respectively)	(7,000,000)	(4,000,000)	(33,000,000)	(25,000,000)
Minimum pension liability adjustment (net of tax of $(1), $(1), $(1), and $(1), respectively)	1,000,000	1,000,000	5,000,000	5,000,000
Other comprehensive income (loss)	29,000,000	(34,000,000)	(37,000,000)	(41,000,000)
Total comprehensive income (loss)	74,000,000	155,000,000	(631,000,000)	119,000,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			5,000,000	(2,000,000)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	12,000,000	(12,000,000)	12,000,000	(14,000,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	3,000,000	2,000,000	12,000,000	9,000,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax		(1,000,000)	(1,000,000)	(1,000,000)
Corporate Interest Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	3,000,000	1,000,000	5,000,000	4,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	3,000,000	0	4,000,000	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	6,000,000	6,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 1,000,000	$ 1,000,000	$ 4,000,000	$ 4,000,000