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Other income (expense) (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Other income (expense)
 
 
Years ended December 31,
 
(Millions of dollars)
 
2017
 
2016
 
2015
 
Investment and interest income
 
$
122

 
$
74

 
$
65

 
Foreign exchange gains (losses) 1 
 
(213
)
 
(57
)
 
(173
)
 
License fee income
 
100

 
92

 
111

 
Gains (losses) on sale of securities and affiliated companies
 
187

3 
47

 
176

2 
Miscellaneous income (loss)
 
11

 
(10
)
 
(18
)
 
Total
 
$
207

 
$
146

 
$
161

 

1 
Includes gains (losses) from foreign exchange derivative contracts.  See Note 3 for further details.
2 
Includes pretax gain of $120 million related to the sale of Caterpillar's equity interest in the third party logistics business.
3 
Includes pretax gain of $85 million related to the sale of Caterpillar's equity interest in Iron Planet Holdings Inc. See Note 9 for further details.