Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 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	$ (1)	$ 1	$ 0	$ 1
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	0	0	(1)
Unrealized gain (loss) on marketable securities	(1)	1	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(2)	(8)	51	(125)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(6)	(3)	(13)	(5)
Foreign currency translation	(8)	(11)	38	(130)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Cash Flow Hedges Arising During Period, before Tax	0	(1)	1	3
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	0	(1)	1	2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	0	0	(1)	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	0	0	0	1
Pension and postretirement benefits	0	0	(1)	1
Other Comprehensive Income (Loss), before Tax	(3)	(8)	51	(121)
Income tax (provision) benefit	(6)	(3)	(13)	(6)
Total other comprehensive income (loss), net of tax	$ (9)	$ (11)	$ 38	$ (127)