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Income Taxes (Unaudited) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Line Items]    
Taxes on U.S. operations $ 71 $ 83
Taxes on international operations 357 408
Total $ 428 $ 491
Consolidated effective income tax rate (percent) 34.00% 33.00%