Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, gross amount	$ 0	$ 0
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	0
Unrealized gain (loss) on marketable securities, net amount	0	0
Foreign currency translation, gross amount	26	58
Foreign currency translation, income tax (provision) benefit	0	0
Foreign currency translation, net amount	26	58
Unrealized gain (loss) on interest rate swaps, gross amount	2	14
Unrealized gain (loss) on interest rate swaps, income tax (provision) benefit	(1)	(5)
Unrealized gain (loss) on interest rate swaps, net amount	1	9
Pension and postretirement benefits, gross amount	12	6
Pension and postretirement benefits, income tax (provision) benefit	(6)	(3)
Pension and postretirement benefits, net amount	6	3
Total other comprehensive income (loss), gross amount	40	78
Total other comprehensive income (loss), income tax (provision) benefit	(7)	(8)
Total other comprehensive income (loss), net of tax	$ 33	$ 70