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Other (Income) Expense, Net (Tables)
 3 Months Ended
Mar. 31, 2020
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 March 31,
($ in millions)
2020
 
2019
Interest income
$
(25
)
 
$
(89
)
Interest expense
212

 
209

Exchange losses
54

 
101

(Income) loss from investments in equity securities, net (1)
(52
)
 
25

Net periodic defined benefit plan (credit) cost other than service cost
(90
)
 
(141
)
Other, net
(28
)
 
83

 
$
71

 
$
188


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