Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Stockholders Equity [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$ 1	$ 3	$ 4	$ 5
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	1	2	3	3
Currency Translation Adjustments, Balance			(80)	51
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance	(6)	(5)	(6)	(5)
Net Unrealized Gains on Available- For-Sale Securities, Balance			0	2
Currency Translation Adjustments, Balance			(65)	(74)
Accumulated Other Comprehensive Income, Balance			(147)	(22)
Currency Translation Adjustments, Current period change	20	(34)	100	(118)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	4	(1)	(4)	(4)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(1)	(2)	(3)	(4)
Accumulated Other Comprehensive Income, Current period change	26	(34)	100	(120)
Currency Translation Adjustments, Balance	20	(67)	20	(67)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance			(2)	(1)
Net Unrealized Gains on Available- For-Sale Securities, Balance	1	0	1	0
Currency Translation Adjustments, Balance	(62)	(70)	(62)	(70)
Accumulated Other Comprehensive Income, Balance	(47)	(142)	(47)	(142)
Derivatives used in Net Investment Hedge, Net of Tax	58		58
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent			100	(118)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax			(4)	(4)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax			3	3
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			93	(127)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			7	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			1	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		$ (1)	(3)	(4)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax			0	(2)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax			0	1
Corporate Interest Expense [Member]
Stockholders Equity [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	2		6	5
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1)		(3)	3
Interest Expense [Member]
Stockholders Equity [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1		1	1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 0		$ 0	$ 1