Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, current period change	$ 0	$ 0
Foreign currency translation, current period change	26	58
Unrealized gain (loss) on interest rate swaps, current period change	2	14
Pension and postretirement benefits, current period change	12	6
Accumulated other comprehensive income (loss), net, current period change	40	78
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	0
Foreign currency translation, income tax (provision) benefit	0	0
Unrealized gain (loss) on interest rate swaps, income tax (provision) benefit	(1)	(5)
Pension and postretirement benefits, income tax (provision) benefit	(6)	(3)
Accumulated other comprehensive income (loss), income tax (provision) benefit	(7)	(8)
Unrealized gain (loss) on marketable securities	(1)		(1)
Foreign currency translation	(2)		(28)
Unrealized gain (loss) on interest rate swaps	(56)		(57)
Pension and postretirement benefits	(758)		(764)
Accumulated other comprehensive income (loss), net	$ (817)		$ (850)