Other Income (Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Income (Expense)
Equity earnings (losses)	$ 3	$ (2)	$ 8	$ 4
Realized (loss) gain on sale of investments	(8)	(1)	2	9
Foreign currency remeasurement gains (losses)	18	(4)		(6)
Hedging losses	(2)	(2)		(2)
Loss on extinguishment of debt		(19)		(19)
Other	1	(1)	2
Other income (expense)	$ 12	$ (29)	$ 12	$ (14)