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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Income Taxes  
Statutory U.S. Federal tax rate (as a percent) 35.00%
Increase (Decrease) in unrecognized tax benefits related to uncertain tax positions $ (38)
Reasonably possible decrease in unrecognized tax benefits related to audit settlements or stature expirations $ 30