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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Before Income Taxes      
United States $ 3,194 $ 2,902 $ 2,516
International 3,368 3,449 3,515
Income before income taxes $ 6,562 $ 6,351 $ 6,031