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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2024
USD ($)
Units
Long-term Contract for Purchase of Electric Power [Line Items]  
Total long-duration contracts revenue recognition | $ 2,616
Total percentage of operating revenues 89.60%
Number of LPCs signed LTA 148
Total Number of LPCs 153
5-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Revenues | $ $ 344
Percentage of total operating revenues 11.80%
Number of LPCs signed LTA 5
20-year Termination Notice [Member]  
Long-term Contract for Purchase of Electric Power [Line Items]  
Revenues | $ $ 2,272
Percentage of total operating revenues 77.80%
Number of LPCs signed LTA 148