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Inventory
12 Months Ended
Dec. 31, 2022
Inventory Disclosure [Abstract]  
INVENTORY INVENTORY
Inventory is valued primarily using the average-cost method. The following table summarizes the Company's inventory balances as of the dates indicated (in millions):
December 31,20222021
Fuel and other raw materials$733 $366 
Spare parts and supplies322 238 
Total$1,055 $604