Stockholders' Equity (Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, current period change	$ 0	$ 0	$ (5)
Foreign currency translation, current period change	(29)	26	10
Unrealized gain (loss) on interest rate swaps, current period change	37	32	23
Pension and postretirement benefits, current period change	(290)	(102)	(150)
Accumulated other comprehensive income (loss), net, current period change	(282)	(44)	(122)
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	(1)	2
Foreign currency translation, income tax (provision) benefit	2	11	(5)
Unrealized gain (loss) on interest rate swaps, income tax (provision) benefit	(10)	(15)	(8)
Pension and postretirement benefits, income tax (provision) benefit	110	39	53
Accumulated other comprehensive income (loss), income tax (provision) benefit	102	34	42
Unrealized gain (loss) on marketable securities	(1)	(1)	0	3
Foreign currency translation	(28)	(1)	(38)	(43)
Unrealized gain (loss) on interest rate swaps	(57)	(84)	(101)	(116)
Pension and postretirement benefits	(764)	(584)	(521)	(424)
Accumulated other comprehensive income (loss), net	$ (850)	$ (670)	$ (660)	$ (580)