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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
Units
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Units
Jun. 30, 2022
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,698 $ 2,970 $ 8,672 $ 8,437
Total long-duration contracts revenue recognition 2,431   7,811  
Total percentage of operating revenues 90.10%   90.00%  
Number of LPCs signed LTA | Units 147   147  
Total Number of LPCs | Units 153   153  
5-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 358   $ 1,070  
Percentage of total operating revenues 13.30%   12.30%  
Number of LPCs signed LTA | Units 6   6  
20-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,073   $ 6,741  
Percentage of total operating revenues 76.80%   77.70%