Operating leases (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Minimum payments for operating leases having initial or remaining non-cancelable terms in excess of one year

Minimum payments for operating leases having initial or remaining non-cancelable terms in excess of one year are:

Years ended December 31,
(Millions of dollars)
2018		2019		2020		2021		2022		Thereafter		Total
$	211	$	142	$	104	$	74	$	58	$	169	$	758