Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) - Equity Component [Domain] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	$ 0	$ 0	$ 0	$ 0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(1)	0	(1)	0
Unrealized gain (loss) on marketable securities	(1)	0	(1)	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	33	(12)	(117)	(15)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	4	(10)	(2)	(2)
Foreign currency translation	37	(22)	(119)	(17)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	1	(3)	4	(3)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0	0	(1)	(3)
Gain (loss) on cash flow hedges	1	(3)	3	(6)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	0	(22)	0	(41)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	4	8	1	15
Pension and postretirement benefits	4	(14)	1	(26)
Other Comprehensive Income (Loss), before Tax	34	(37)	(113)	(59)
Income tax (provision) benefit	7	(2)	(3)	10
Total	$ 41	$ (39)	$ (116)	$ (49)