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Other Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Non-Financial Services

The amounts included in Non-Financial Services other income/(loss), net for the years ended December 31 were as follows (in millions):
 
2015
 
2016
 
2017
Net periodic pension and OPEB income/(cost), excluding service cost
$
666

 
$
(1,625
)
 
$
1,757

Investment-related interest income
233

 
217

 
346

Interest income/(expense) on income taxes
—

 
(5
)
 
(3
)
Realized and unrealized gains/(losses) on cash equivalents and marketable securities
46

 
(9
)
 
(22
)
Gains/(Losses) on changes in investments in affiliates
42

 
139

 
7

Gains/(Losses) on extinguishment of debt
1

 
—

 
—

Royalty income
666

 
714

 
678

Other
200

 
300

 
297

Total
$
1,854

 
$
(269
)
 
$
3,060


Financial Services

The amounts included in Financial Services other income/(loss), net for the years ended December 31 were as follows (in millions):
 
2015
 
2016
 
2017
Investment-related interest income
$
76

 
$
74

 
$
113

Interest income/(expense) on income taxes
3

 
8

 
5

Insurance premiums earned
133

 
156

 
—

Other
160

 
200

 
89

Total
$
372

 
$
438

 
$
207