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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
Units
Mar. 31, 2022
USD ($)
Mar. 31, 2023
USD ($)
Units
Mar. 31, 2022
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,959 $ 2,884 $ 5,974 $ 5,467
Total long-duration contracts revenue recognition 2,674   5,380  
Total percentage of operating revenues 90.40%   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] $ 351   $ 712  
Percentage of total operating revenues 11.90%   11.90%  
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] $ 2,323   $ 4,668  
Percentage of total operating revenues 78.50%   78.10%