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Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Balance By Type
The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
 
June 30, 2020
 
December 31, 2019
Fuel and other raw materials
$
254

 
$
230

Spare parts and supplies
250

 
257

Total
$
504

 
$
487