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Income Taxes (Details Textuals) (USD $)
In Millions
6 Months Ended
Jun. 30, 2011
Income Taxes (Textuals)  
Unrecognized tax benefits as a result of potential resolutions of prior years' tax $ 679
Unrecognized tax benefits, amounts recorded to equity 452
Unrecognized tax benefits impact not possible to quantify 227
Open tax years by major tax jurisdiction 2005 through 2007
Tax Benefits 102
Tax Benefits from Discontinued Operations $ 36