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Inventory (Tables)
 6 Months Ended
Jun. 30, 2022
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, 2022December 31, 2021
Fuel and other raw materials$573 $366 
Spare parts and supplies298 238 
Total$871 $604