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Operating leases (Tables)
12 Months Ended
Dec. 31, 2016
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)
2017
 
2018
 
2019
 
2020
 
2021
 
Thereafter
 
Total
$
211

 
$
160

 
$
107

 
$
81

 
$
61

 
$
176

 
$
796