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Revenue Local Power Company Contracts (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2023
USD ($)
Units
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Number of LPCs signed LTA | Units 147    
Electric revenue $ 11,899 $ 12,371 $ 10,357
Total number of LPCs | Units 153    
Percentage of total operating revenues 90.40%    
Percent of wholesale Credit offered 3.10%    
20-year contract arrangement [Member]      
Electric revenue $ 9,367    
5-year contract arrangement [Member]      
Electric revenue 1,536    
Local Power Company [Member]      
Electric revenue $ 10,903 $ 11,291 $ 9,534
5-year contract arrangement [Member]      
Number of LPCs signed LTA | Units 6    
Percentage of total operating revenues 12.70%