Income Taxes (Details) FIN 48 (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Unrecognized Tax Benefit Rollforward [Abstract]
Unrecognized Tax Benefits, Beginning Balance	$ 103	$ 75
Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions	3	4
Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions	(3)	(4)
Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions	71	16
Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions	(24)	(22)
Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities	(9)	(1)
Unrecognized Tax Benefits, Ending Balance	141	68
Unrecognized Tax Benefits That Would Impact Effective Tax Rate	90
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit	$ 10