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Inventories, net (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories, net consisted of the following:
 
December 31,
2019
 
December 31,
2018
 
(in millions)
Fuel
$
412

 
$
363

Other
7

 
11

Inventories, net
$
419

 
$
374