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Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2015
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)
 
2016

 
2017

 
2018

 
2019

 
2020

 
After 2020

Lease commitments
 
$
202

 
$
196

 
$
170

 
$
143

 
$
119

 
$
1,002