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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
Future minimum lease payments under non-cancellable operating leases as of December 31, 2018, follow:
 
 
 
 
 
 
 
 
 
 
 
 
After

 
 
(MILLIONS OF DOLLARS)
 
2019

 
2020

 
2021

 
2022

 
2023

 
2023

 
Total

Maturities
 
$
38

 
$
30

 
$
24

 
$
21

 
$
15

 
$
45

 
$
173