Stockholders' Equity (Schedule of Adjustments to Accumulated 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	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Unrealized gain (loss) on marketable securities, current period change	$ 0	$ 0	$ 0	$ 0
Foreign currency translation, current period change	28	(69)	4	18
Unrealized gain (loss) on interest rate swaps, current period change	(2)	7	(1)	22
Pension and postretirement benefits, current period change	15	6	41	19
Accumulated other comprehensive income (loss), net, current period change	41	(56)	44	59
Unrealized gain (loss) on marketable securities, income tax (provision) benefit	0	0	0	0
Foreign currency translation, income tax (provision) benefit	0	0	0	0
Unrealized gain (loss) on interest rate swaps, income tax (provision) benefit	0	(2)	0	(8)
Pension and postretirement benefits, income tax (provision) benefit	(5)	(2)	(16)	(7)
Accumulated other comprehensive income (loss), income tax (provision) benefit	(5)	(4)	(16)	(15)
Unrealized gain (loss) on marketable securities	(1)		(1)		(1)
Foreign currency translation	(24)		(24)		(28)
Unrealized gain (loss) on interest rate swaps	(58)		(58)		(57)
Pension and postretirement benefits	(739)		(739)		(764)
Accumulated other comprehensive income (loss), net	$ (822)		$ (822)		$ (850)