Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Currency Translation Adjustments, Balance			$ 51	$ 166
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance	$ (5)	$ 2	(5)	2
Net Unrealized Gains on Available- For-Sale Securities, Balance			2	2
Currency Translation Adjustments, Balance			(74)	(52)
Accumulated Other Comprehensive Income, Balance			(22)	117
Currency Translation Adjustments, Current period change	(34)	(79)	(118)	(71)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(1)	3	(4)	1
Net unrealized gains on available-for-sale securities, net of tax	(1)	0	(2)	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(2)	0	(4)	(1)
Accumulated Other Comprehensive Income, Current period change	(34)	(76)	(120)	(68)
Currency Translation Adjustments, Balance	(67)	95	(67)	95
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance			(1)	1
Net Unrealized Gains on Available- For-Sale Securities, Balance	0	3	0	3
Currency Translation Adjustments, Balance	(70)	(51)	(70)	(51)
Accumulated Other Comprehensive Income, Balance	(142)	49	(142)	49
Derivatives used in Net Investment Hedge, Net of Tax	60		60
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent			(118)	(71)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax			(4)	1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	3		5
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax	2		3	1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(127)	(73)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			7	5
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	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	2	2		6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ (1)	$ (1)	(4)	(4)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax			(2)	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax			$ 1	$ 0