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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill by segment and changes during the period
Goodwill by segment and changes in goodwill are reflected in the following table (in millions):
 
Transportation
 
Facilities
 
Supply and Logistics
 
Total
Balance at December 31, 2017
$
1,070

 
$
988

 
$
508

 
$
2,566

Foreign currency translation adjustments
(8
)
 
(3
)
 
(2
)
 
(13
)
Dispositions
(10
)
 
(3
)
 
—

 
(13
)
Balance at September 30, 2018
$
1,052

 
$
982

 
$
506

 
$
2,540