Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), net [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 0	$ 0	$ 1	$ 0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	(1)	0	(1)
Unrealized gain (loss) on marketable securities	0	(1)	1	(1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(17)	33	53	(117)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(1)	4	(7)	(2)
Foreign currency translation	(18)	37	46	(119)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, before Tax	1	1	1	4
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, Tax	0	0	0	(1)
Gain (loss) on cash flow hedges	1	1	1	3
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(1)	0	(1)	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	0	4	0	1
Pension and postretirement benefits	(1)	4	(1)	1
Other Comprehensive Income (Loss), before Tax	(17)	34	54	(113)
Income tax (provision) benefit	(1)	7	(7)	(3)
Total other comprehensive income (loss), net of tax	$ (18)	$ 41	$ 47	$ (116)