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Revenue Local Power Company Contracts (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2024
USD ($)
Units
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Electric revenue | $ $ 12,123 $ 11,888 $ 12,352
Total number of LPCs | Units 153    
Percentage of total operating revenues 90.40%    
Percent of wholesale Credit offered 3.10%    
Local Power Company [Member]      
Electric revenue | $ $ 11,138    
5-year contract arrangement [Member]      
Number of LPCs signed LTA | Units 5    
Percentage of total operating revenues 12.30%