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Other (Income) Expense, Net (Tables)
 6 Months Ended
Jun. 30, 2019
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)
2019
 
2018
 
2019
 
2018
Interest income
$
(75
)
 
$
(81
)
 
$
(164
)
 
$
(165
)
Interest expense
233

 
194

 
442

 
379

Exchange losses
27

 
71

 
128

 
77

Income from investments in equity securities, net (1)
(58
)
 
(153
)
 
(32
)
 
(178
)
Net periodic defined benefit plan (credit) cost other than service cost
(140
)
 
(130
)
 
(281
)
 
(265
)
Other, net
153

 
51

 
234

 
(188
)
 
$
140

 
$
(48
)
 
$
327

 
$
(340
)

(1) 
Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investments funds.