Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), net [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 1	$ 0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	0
Unrealized gain (loss) on marketable securities	1	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	70	(150)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(6)	(6)
Foreign currency translation	64	(156)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, before Tax	0	3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, Tax	0	(1)
Gain (loss) on cash flow hedges	0	2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	0	(3)
Pension and postretirement benefits	0	(3)
Other Comprehensive Income (Loss), before Tax	71	(147)
Income tax (provision) benefit	(6)	(10)
Total other comprehensive income (loss), net of tax	$ 65	$ (157)