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Other (Income) Expense, Net (Tables)
 3 Months Ended
Mar. 31, 2017
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 March 31,
($ in millions)
2017
 
2016
Interest income
$
(97
)
 
$
(79
)
Interest expense
182

 
172

Exchange (gains) losses
(8
)
 
38

Equity loss (income) from affiliates
13

 
(34
)
Other, net
(32
)
 
(49
)
 
$
58

 
$
48