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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Units
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Units
Jun. 30, 2021
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,970 $ 2,527 $ 8,437 $ 7,403
Total long-duration contracts revenue recognition 2,662   7,576  
Total percentage of operating revenues 89.70%   89.80%  
Number of LPCs signed LTA | Units 146   146  
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] $ 412   $ 1,103  
Percentage of total operating revenues 13.90%   13.10%  
Number of LPCs signed LTA | Units 7   7  
20-year Termination Notice [Member]        
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,250   $ 6,473  
Percentage of total operating revenues 75.80%   76.70%