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Inventory (Tables)
 3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Inventory Balance By Type
The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
March 31, 2024December 31, 2023
Fuel and other raw materials$337 $424 
Spare parts and supplies302 288 
Total$639 $712