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Inventory
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
INVENTORY INVENTORY
The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
September 30, 2020December 31, 2019
Fuel and other raw materials$227 $230 
Spare parts and supplies247 257 
Total$474 $487