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Lease Commitments
 12 Months Ended
Dec. 31, 2017
Lease Commitments [Abstract]  
Lease Commitments
Lease Commitments
We lease some of our offices, buildings, machinery and equipment, and autos under noncancelable operating leases. These leases have various escalation terms and renewal options. Lease expense amounted to $38 million in 2017, $37 million in 2016 and $36 million in 2015. Future minimum lease payments required under operating leases with initial or remaining noncancelable terms in excess of one year as of December 31, 2017 were as follows:
(millions)
2018
 
2019
 
2020
 
2021
 
2022
 
After 2022
Future minimum lease payments
$
36

 
$
31

 
$
25

 
$
19

 
$
10

 
$
9