Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Treasury Stock, Shares, Acquired	1.2
Treasury Stock Acquired, Average Cost Per Share	$ 15.29
Treasury Stock, Value, Acquired, Par Value Method	$ 18
Cash Dividend Declared Per Share:		$ 0.25	$ 0.25
Payments of Ordinary Dividends, Common Stock		$ 33	$ 33
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		(25)	(25)	$ (34)	$ (12)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		2	2	2	2
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		(9)	(19)
Accumulated Other Comprehensive Income Loss Cumulative Changes In Derivatives Arising During Period Net Of Tax				(2)	(12)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax		0	0	0	0
Accumulated other comprehensive (loss) income		(32)	(42)	$ (34)	$ (22)
Other Comprehensive Income Before Reclassification Adjustments		2	(20)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax		0	0
Other Comprehensive Income Reclassified from AOCI		0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax		0	0
Foreign currency translation		9	(13)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		0	0
Net unrealized gain (loss) on derivative instruments, net of tax		(7)	(7)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax		0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		2	(20)
Foreign Currency Translation [Member]
Other Comprehensive Income Before Reclassification Adjustments		9	(13)
Other Comprehensive Income Reclassified from AOCI		0	0
Unrealized Gain Loss on Derivatives [Member]
Other Comprehensive Income Before Reclassification Adjustments		(7)	(7)
Other Comprehensive Income Reclassified from AOCI		0	0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Other Comprehensive Income Before Reclassification Adjustments		0	0
Other Comprehensive Income Reclassified from AOCI		$ 0	$ 0