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Other (Income) Expense, Net (Tables)
 3 Months Ended
Mar. 31, 2018
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 March 31,
($ in millions)
2018
 
2017
Interest income
$
(85
)
 
$
(97
)
Interest expense
185

 
182

Exchange losses (gains)
7

 
(8
)
Equity losses from affiliates
52

 
13

Net periodic defined benefit plan (credit) cost other than service cost
(135
)
 
(129
)
Other, net
(315
)
 
(32
)
 
$
(291
)
 
$
(71
)