Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
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	$ 1	$ 0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0	0	(1)	0
Unrealized gain (loss) on marketable securities	1	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(8)	(127)	(125)	(142)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(3)	3	(5)	1
Foreign currency translation	(11)	(124)	(130)	(141)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(1)	(8)	3	(11)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0	3	(1)	0
Gain (loss) on cash flow hedges	(1)	(5)	2	(11)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	0	(16)	0	(57)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	0	8	1	23
Pension and postretirement benefits	0	(8)	1	(34)
Other Comprehensive Income (Loss), before Tax	(8)	(151)	(121)	(210)
Income tax (provision) benefit	3	(14)	6	(24)
Total other comprehensive income (loss), net of tax	$ (11)	$ (137)	$ (127)	$ (186)