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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill by segment and changes during the period
Goodwill by segment and changes in goodwill is reflected in the following table (in millions):

 
Transportation
 
Facilities
 
Supply and Logistics
 
Total
Balance at December 31, 2015
$
815

 
$
1,087

 
$
503

 
$
2,405

Foreign currency translation adjustments
6

 
3

 
1

 
10

Dispositions and reclassifications to assets held for sale
(15
)
 
(56
)
 
—

 
(71
)
Balance at December 31, 2016
$
806

 
$
1,034

 
$
504

 
$
2,344

Acquisitions
269

 
—

 
—

 
269

Foreign currency translation adjustments
16

 
7

 
4

 
27

Dispositions and reclassifications to assets held for sale
(21
)
 
(53
)
 
—

 
(74
)
Balance at December 31, 2017
$
1,070

 
$
988

 
$
508

 
$
2,566