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Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Financial Information [Abstract]      
Interest $ 2,314 $ 2,441 $ 1,983
Income taxes $ 2,841 $ 1,626 $ 1,864