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Other (Income) Expense, Net (Tables)
 6 Months Ended
Jun. 30, 2020
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)
2020
 
2019
 
2020
 
2019
Interest income
$
(14
)
 
$
(75
)
 
$
(39
)
 
$
(164
)
Interest expense
209

 
233

 
421

 
442

Exchange losses
24

 
27

 
78

 
128

Income from investments in equity securities, net (1)
(551
)
 
(58
)
 
(603
)
 
(32
)
Net periodic defined benefit plan (credit) cost other than service cost
(80
)
 
(140
)
 
(170
)
 
(281
)
Other, net
22

 
153

 
(5
)
 
234

 
$
(390
)
 
$
140

 
$
(318
)
 
$
327


(1) 
Includes net realized and unrealized gains and losses from investments in equity securities either owned directly or through ownership interests in investment funds. Unrealized gains and losses from investments that are directly owned are determined at the end of the reporting period, while ownership interests in investment funds are accounted for on a one quarter lag. The Company estimates that gains of approximately $300 million will be recognized in the third quarter of 2020 from ownership interests in investment funds.