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Inventory
12 Months Ended
Dec. 31, 2025
Inventory Disclosure [Abstract]  
Inventory Inventory
Inventory consisted of:
 As of December 31,
(In millions)20252024
Coal$111 $194 
Natural gas177 126 
Fuel oil11 
Finished goods73 79 
Spare parts89 71 
Total Inventory$461 $478