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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Domestic And Foreign Components Of Income Before Income Taxes [Abstract]      
Income before income taxes, Domestic $ 1,282 $ 727 $ 761
Income before income taxes, Foreign 1,640 1,670 1,447
Total 2,922 2,397 2,208
Current:      
Federal 484 421 526
State 37 34 35
Foreign 768 448 348
Total current income tax provision 1,289 903 909
Deferred:      
Federal (28) (260) (249)
State (3) (8) (5)
Foreign (321) 103 80
Total deferred income tax provision (352) (165) (174)
Total income tax provision $ 937 $ 738 $ 735