Investments in unconsolidated affiliated companies (Tables)

12 Months Ended

Dec. 31, 2017

Equity Method Investments and Joint Ventures [Abstract]

Investments in unconsolidated affiliated companies

	December 31,
(Millions of dollars)	2017		2016
Investments in equity method companies	$	212	$	192
Plus: Investments in cost method companies	31		57
Total investments in unconsolidated affiliated companies	$	243	$	249