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Investments (Details Textuals 26) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investments [Abstract]        
Gains (losses) from foreign currency transactions $ (79) $ 94 $ (56) $ 80