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Tax (Tables)
9 Months Ended
Sep. 30, 2011
Tax [Abstract] 
Difference between the effective tax rate
The difference between the effective tax rate reflected in the provision for income taxes and the U.S. federal statutory rate of 35% was as follows (in millions):
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Federal income tax at U.S. federal statutory rate
  $ 273     $ 201     $ 728     $ 621  
Foreign income tax rate differential
    (29 )     (28 )     (94 )     (86 )
State income tax, net of federal benefit
    6       3       17       10  
Nondeductible expenses
    9       6       33       30  
Tax benefit of manufacturing deduction
    (14 )     (8 )     (26 )     (14 )
Foreign dividends, net of foreign tax credits
    33       2       43       9  
Tax rate change on temporary differences
    (5 )           (18 )      
Other
    (21 )     (7 )     (16 )     (18 )
 
                       
Provision for income taxes
  $ 252     $ 169     $ 667     $ 552