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Inventory
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventory
Inventory
Inventory consisted of:
 
As of December 31,
 
2018
 
2017
 
(In millions)
Fuel oil
$
74

 
$
86

Coal
97

 
110

Natural gas
28

 
24

Spare parts
213

 
233

Total Inventory
$
412


$
453


The Company recorded a lower of weighted average cost or market adjustment related to fuel oil for the years ended, December 21, 2018 and 2017 of $3 million and $33 million respectively.