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Inventory (Tables)
12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory consisted of:
 As of December 31,
(In millions)20232022
Fuel oil$$
Coal178 114 
Natural gas189 385 
Spare parts68 136 
Finished goods164 108 
Total Inventory$607 $751