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Other Income/(Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
The amounts included in other income/(loss), net for the periods ended September 30 were as follows (in millions):
 
Third Quarter
 
First Nine Months
 
2017
 
2018
 
2017
 
2018
Net periodic pension and other postretirement employee benefits (OPEB) income/(cost), excluding service cost
$
365

 
$
378

 
$
1,144

 
$
1,284

Investment-related interest income
124

 
169

 
325

 
482

Interest income/(expense) on income taxes
(2
)
 
(5
)
 
(1
)
 
28

Realized and unrealized gains/(losses) on cash equivalents, marketable securities, and other securities
(13
)
 
(76
)
 
14

 
136

Gains/(Losses) on changes in investments in affiliates
(21
)
 
(14
)
 
(23
)
 
44

Royalty income
171

 
115

 
475

 
387

Other
130

 
38

 
286

 
111

Total
$
754

 
$
605

 
$
2,220

 
$
2,472