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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
USD ($)
Units
Mar. 31, 2025
USD ($)
Units
Long-term Contract for Purchase of Electric Power [Line Items]    
Total long-duration contracts revenue recognition | $ 3,199 5,815
Total percentage of operating revenues 90.50% 90.10%
Number of LPCs signed LTA 148 148
Total Number of LPCs 153 153
5-year Termination Notice [Member]    
Long-term Contract for Purchase of Electric Power [Line Items]    
Revenues | $ $ 400 $ 744
Percentage of total operating revenues 11.30% 11.50%
Number of LPCs signed LTA 5 5
20-year Termination Notice [Member]    
Long-term Contract for Purchase of Electric Power [Line Items]    
Revenues | $ $ 2,799 $ 5,071
Percentage of total operating revenues 79.20% 78.60%
Number of LPCs signed LTA 148 148