Stockholders' Equity (Schedule of Components of Other Comprehensive Income (Loss), Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, gross amount	$ 0	$ 0	$ 0	$ 0
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	0	0	0
Unrealized gain (loss) on marketable securities, net amount	0	0	0	0
Foreign currency translation, gross amount	28	(69)	4	18
Foreign currency translation, income tax (provision) benefit	0	0	0	0
Foreign currency translation, net amount	28	(69)	4	18
Unrealized gain (loss) on interest rate swaps, gross amount	(2)	7	(1)	22
Unrealized gain (loss) on interest rate swaps, income tax (provision) benefit	0	(2)	0	(8)
Unrealized gain (loss) on interest rate swaps, net amount	(2)	5	(1)	14
Pension and postretirement benefits, gross amount	15	6	41	19
Pension and postretirement benefits, income tax (provision) benefit	(5)	(2)	(16)	(7)
Pension and postretirement benefits, net amount	10	4	25	12
Total other comprehensive income (loss), gross amount	41	(56)	44	59
Total other comprehensive income (loss), income tax (provision) benefit	(5)	(4)	(16)	(15)
Total other comprehensive income (loss), net of tax	$ 36	$ (60)	$ 28	$ 44