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Other (Income) Expense, Net (Tables)
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
($ in millions)
2018
 
2017
 
2018
 
2017
Interest income
$
(81
)
 
$
(96
)
 
$
(165
)
 
$
(194
)
Interest expense
194

 
193

 
379

 
375

Exchange losses
71

 
19

 
77

 
11

Equity (gains) losses from affiliates
(64
)
 
(5
)
 
(12
)
 
8

Net periodic defined benefit plan (credit) cost other than service cost
(130
)
 
(131
)
 
(265
)
 
(260
)
Other, net
(38
)
 
(53
)
 
(354
)
 
(83
)
 
$
(48
)
 
$
(73
)
 
$
(340
)
 
$
(143
)