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Inventories, net (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following:
 
December 31,
2017
 
December 31,
2016
 
(in millions)
Fuel
$
387

 
$
383

Merchandise
30

 
29

Other
9

 
11

Inventories, net
$
426

 
$
423