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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2024
USD ($)
Units
Jun. 30, 2024
USD ($)
Units
Long-term Contract for Purchase of Electric Power [Line Items]    
Total long-duration contracts revenue recognition | $ 2,596 7,925
Total percentage of operating revenues 90.20% 90.10%
Number of LPCs signed LTA 147 147
Total Number of LPCs 153 153
5-year Termination Notice [Member]    
Long-term Contract for Purchase of Electric Power [Line Items]    
Revenues | $ $ 369 $ 1,060
Percentage of total operating revenues 12.80% 12.10%
Number of LPCs signed LTA 6 6
20-year Termination Notice [Member]    
Long-term Contract for Purchase of Electric Power [Line Items]    
Revenues | $ $ 2,227 $ 6,865
Percentage of total operating revenues 77.40% 78.00%
Number of LPCs signed LTA 147 147