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Other (Income) Expense, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
($ in millions)
2018
 
2017
 
2018
 
2017
Interest income
$
(92
)
 
$
(90
)
 
$
(257
)
 
$
(284
)
Interest expense
190

 
189

 
569

 
564

Exchange losses (gains)
42

 
(6
)
 
119

 
5

Equity income from affiliates
(81
)
 
(18
)
 
(93
)
 
(11
)
Net periodic defined benefit plan (credit) cost other than service cost
(119
)
 
(121
)
 
(384
)
 
(381
)
Other, net
(112
)
 
(161
)
 
(466
)
 
(244
)
 
$
(172
)
 
$
(207
)
 
$
(512
)
 
$
(351
)