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Inventory (Tables)
12 Months Ended
Dec. 31, 2024
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory consisted of:
 As of December 31,
(In millions)20242023
Coal$194 $178 
Natural gas126 189 
Fuel oil
Finished goods79 164 
Spare parts71 68 
Total Inventory$478 $607