Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 0		$ 0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	0		0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	0		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(150)		(3)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(6)		8
Foreign currency translation	(156)		5
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	3	[1]	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(1)		(3)
Gain (loss) on cash flow hedges	2		(3)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	0		(19)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(3)		7
Pension and postretirement benefits	(3)		(12)
Other Comprehensive Income (Loss), before Tax	(147)		(22)
Income tax (provision) benefit	(10)		(12)
Other comprehensive income (loss), net of tax	(157)		(10)
Equity Method Investments' Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (1)

[1] Includes $1 million of losses related to the Company's equity method investments' derivative activity.