Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Net income (loss)	$ 62	$ 26	$ (29)	$ (61)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments (net of tax of $4, $(10), $(2), and $(5) respectively)	9	(54)	10	(53)
Net unrealized gain (loss) on cash flow hedges (net of tax of $4, $(1), and $7, and $(3) respectively)	(13)	2	(21)	8
Minimum pension liability adjustment (net of tax of $0, $0, $0, and $(1), respectively)	2	2	4	3
Other comprehensive income (loss)	(2)	(50)	(7)	(42)
Total comprehensive income (loss)	60	(24)	(36)	(103)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			(2)	0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	4	(10)	(2)	(5)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	4	(1)	7	(3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	0	0	0	(1)
Corporate Interest Expense [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1		3
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	1		2
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	2	4	4
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 2	$ 1	$ 3	$ 2