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Commitments and Contingencies (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2025
USD ($)
MW
Oct. 31, 2024
USD ($)
Mar. 31, 2025
unit
MW
Minimum [Member]      
Commitments and Contingencies [Line Items]      
Generation Capacity | MW 400   400
Power island equipment      
Commitments and Contingencies [Line Items]      
Long-Term Purchase Commitment, Minimum Quantity Required | unit     15
Combustion turbine      
Commitments and Contingencies [Line Items]      
Long-Term Purchase Commitment, Minimum Quantity Required | unit     2
Palisades      
Commitments and Contingencies [Line Items]      
Litigation Settlement, Amount Awarded from Other Party   $ 7  
Proceeds from Legal Settlements $ 7    
Damages awarded for costs previously recorded as spending on the asset retirement obligation   4  
Damages awarded for costs previously recorded as other operation and maintenance expenses   $ 3