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Inventory (Tables)
9 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Inventory Balance By Type
The following table summarizes the Company’s inventory balances as of the dates indicated (in millions):
September 30, 2025December 31, 2024
Spare parts and supplies$388 $347 
Fuel and other raw materials219 246 
Total$607 $593