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Income Taxes (Details 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Difference between the effective tax rate      
Federal income tax at U.S. federal statutory rate $ 1,023 $ 839 $ 773
Foreign income tax rate differential (152) (117) (120)
State income tax, net of federal benefit 22 17 18
Nondeductible expenses 42 40 30
Tax benefit of manufacturing deduction (37) (19) (17)
Foreign dividends, net of foreign tax credits 9 15 10
Change in deferred tax valuation allowance (18)    
Other 48 (37) 41
Total income tax provision $ 937 $ 738 $ 735