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Revenue Local Power Company Contracts (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2021
USD ($)
Units
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Number of LPCs signed LTA | Units 145    
Electric revenue $ 10,357 $ 10,104 $ 11,159
Total number of LPCs | Units 153    
Percentage of total operating revenues 90.70%    
Percent of op revenues of LPCs who filed complaint with FERC 3.00%    
Percent of wholesale Credit offered 3.10%    
20-year contract arrangement [Member]      
Electric revenue $ 7,987    
5-year contract arrangement [Member]      
Electric revenue 1,547    
Local Power Company [Member]      
Electric revenue $ 9,534 $ 9,406 $ 10,351
5-year contract arrangement [Member]      
Number of LPCs signed LTA | Units 8    
Percentage of total operating revenues 14.70%