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Other (Income) Expense, Net (Tables)
9 Months Ended
Sep. 30, 2011
Other (Income) Expense, Net [Abstract] 
Other (income) expense, net
     Other (income) expense, net, consisted of:
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
($ in millions)   2011     2010     2011     2010  
 
Interest income
  $ (45 )   $ (23 )   $ (137 )   $ (57 )
Interest expense
    189       173       557       539  
Exchange losses
    59       8       102       84  
Other, net
    (137 )     950       287       429  
 
 
  $ 66     $ 1,108     $ 809     $ 995