Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Net income	$ 189	$ 213	$ 160	$ 152
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments (net of tax of $(12), $(1), $(14), and $(6) respectively)	(31)	(8)	(21)	(61)
Net unrealized gain (loss) on cash flow hedges (net of tax of $2, $0, and $9, and $(3) respectively)	(4)	0	(25)	8
Minimum pension liability adjustment (net of tax of $(1), $0, $(1), and $(1), respectively)	1	2	5	5
Other comprehensive income (loss)	(34)	(6)	(41)	(48)
Total comprehensive income (loss)	155	207	119	104
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			(2)	(1)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(12)	(1)	(14)	(6)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	2	0	9	(3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	(1)	0	(1)	(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	2	4	2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	1	2	1
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	6	6
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 1	$ 2	$ 4	$ 4