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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2014
$
854

 
$
1,152

 
$
459

 
$
2,465

Acquisitions
3

 
8

 
—

 
11

Foreign currency translation adjustments
(42
)
 
(19
)
 
(10
)
 
(71
)
Other
—

 
(54
)
 
54

 
—

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