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Inventory (Tables)
 6 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventory
Successor
June 30, 2024December 31, 2023
Coal$113 $152 
Oil products70 75 
Fuel inventory for electric generation183 227 
Materials and supplies, net77 72 
Environmental products20 76 
Inventory, net$280 $375