Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, gross amount	$ 0	$ 0	$ (5)
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	(1)	2
Unrealized gain (loss) on marketable securities, net amount	0	(1)	(3)
Foreign currency translation, gross amount	(29)	26	10
Foreign currency translation, income tax (provision) benefit	2	11	(5)
Foreign currency translation, net amount	(27)	37	5
Unrealized gain (loss) on interest rate swaps, gross amount	37	32	23
Unrealized gain (loss) on interest rate swaps, income tax (provision) benefit	(10)	(15)	(8)
Unrealized gain (loss) on interest rate swaps, net amount	27	17	15
Pension and postretirement benefits, gross amount	(290)	(102)	(150)
Pension and postretirement benefits, income tax (provision) benefit	110	39	53
Pension and postretirement benefits, net amount	(180)	(63)	(97)
Total other comprehensive income (loss), gross amount	(282)	(44)	(122)
Total other comprehensive income (loss), income tax (provision) benefit	102	34	42
Total other comprehensive income (loss), net of tax	$ (180)	$ (10)	$ (80)