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Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of Future Minimum Rental Commitments Under Non-Cancelable Operating Leases
The future minimum rental commitments under non-cancelable operating leases follow:
(MILLIONS OF DOLLARS)
 
2018

 
2019

 
2020

 
2021

 
2022

 
After 2022

Lease commitments
 
$
209

 
$
172

 
$
150

 
$
136

 
$
123

 
$
891