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Inventory (Tables)
 9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventory
Successor
September 30, 2024December 31, 2023
Coal$104 $152 
Oil products69 75 
Fuel inventory for electric generation173 227 
Materials and supplies, net83 72 
Environmental products41 76 
Inventory, net$297 $375