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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Before Income Taxes        
Income before income taxes $ 1,880 $ 1,716 $ 5,388 $ 5,004