Other Income (Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other (Expense) Income
Equity earnings	$ 6	$ 0	$ 12	$ 8
Gains on investments	37	9	36	11
Foreign currency remeasurement (losses) gains	(4)	(24)	15	(24)
Derivative gains (losses)	1	8	(8)	8
Other	(1)	(2)	(1)	0
Other Income	$ 39	$ (9)	$ 54	$ 3