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Investments in unconsolidated affiliated companies (Tables)
 12 Months Ended
Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Investments in unconsolidated affiliated companies
Caterpillar’s investments in unconsolidated affiliated companies:
 
 
 
 
 
 
December 31,
(Millions of dollars)
 
2016
 
2015
Investments in equity method companies
 
$
192

 
$
203

Plus: Investments in cost method companies
 
57

 
43

Total investments in unconsolidated affiliated companies
 
$
249

 
$
246