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Income Taxes (Details Textuals) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Income Taxes (Textuals) [Abstract]  
Unrecognized tax benefits as a result of potential resolutions of prior years' tax $ 902
Unrecognized tax benefits, amounts recorded to equity 685
Unrecognized tax benefits impact not possible to quantify 217
Open tax years by major tax jurisdiction 2005 through 2007
Tax benefit due to foreign tax credits $ 50