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Income Taxes (Unaudited) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Income Tax Disclosure [Abstract]    
Taxes on U.S. operations $ 83 $ 138
Taxes on international operations 408 846
Total $ 491 $ 984
Consolidated effective income tax rate (percent) 33.00% 35.00%