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Inventory
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
INVENTORY INVENTORY
The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
March 31, 2022December 31, 2021
Fuel and other raw materials$407 $366 
Spare parts and supplies281 238 
Total$688 $604