Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stockholders Equity [Line Items]
Document Period End Date			Sep. 30, 2017
Currency Translation Adjustments, Balance			$ (39)	$ (80)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance	$ 2	$ (6)	2	(6)
Net Unrealized Gains on Available- For-Sale Securities, Balance			1	0
Currency Translation Adjustments, Balance			(118)	(65)
Accumulated Other Comprehensive Income, Balance			(154)	(147)
Currency Translation Adjustments, Current period change	32	20	105	100
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1	4	0	(4)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(1)	(1)	(4)	(3)
Accumulated Other Comprehensive Income, Current period change	34	26	110	100
Currency Translation Adjustments, Balance	66	20	66	20
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance			2	(2)
Net Unrealized Gains on Available- For-Sale Securities, Balance	2	1	2	1
Currency Translation Adjustments, Balance	(114)	(62)	(114)	(62)
Accumulated Other Comprehensive Income, Balance	(44)	(47)	(44)	(47)
Derivatives used in Net Investment Hedge, Net of Tax	39		39
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent			105	100
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax			0	(4)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax			4	3
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			104	93
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			6	7
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax			0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax			0	1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax			(2)	(3)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax			1	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax			0	0
Corporate Interest Expense [Member]
Stockholders Equity [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1	2	3	6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1)	(1)	(2)	(3)
Selling, General and Administrative Expenses [Member]
Stockholders Equity [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	2	1	6	4
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 1	$ 1	$ 4	$ 3