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Investments in Unconsolidated Affiliated Companies (Tables)
 6 Months Ended
Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Caterpillar's investments in unconsolidated affiliated companies
 
 
 
 
Caterpillar’s investments in unconsolidated affiliated companies: 
 
 
 
(Millions of dollars)
June 30,
2016
 
December 31,
2015
Investments in equity method companies
$
197

 
$
203

Plus: Investments in cost method companies
49

 
43

Total investments in unconsolidated affiliated companies
$
246

 
$
246