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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2016
$
806

 
$
1,034

 
$
504

 
$
2,344

Acquisitions (1)
271

 
—

 
—

 
271

Foreign currency translation adjustments
8

 
4

 
2

 
14

Dispositions and reclassifications to assets held for sale
—

 
(33
)
 
—

 
(33
)
Balance at June 30, 2017
$
1,085

 
$
1,005

 
$
506

 
$
2,596

 
(1) 
Goodwill is recorded at the acquisition date based on a preliminary fair value determination. This preliminary goodwill balance may be adjusted when the fair value determination is finalized.