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Other (Income) Expense, Net (Tables)
 3 Months Ended
Mar. 31, 2019
Other Income and Expenses [Abstract]  
Other (Income) Expense, Net
Other (income) expense, net, consisted of: 
 
Three Months Ended 
 March 31,
($ in millions)
2019
 
2018
Interest income
$
(89
)
 
$
(85
)
Interest expense
209

 
185

Exchange losses
101

 
7

Loss (income) from investments in equity securities, net (1)
25

 
(25
)
Net periodic defined benefit plan (credit) cost other than service cost
(141
)
 
(135
)
Other, net
83

 
(238
)
 
$
188

 
$
(291
)

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