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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2022
USD ($)
Units
Mar. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Units
Mar. 31, 2021
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]        
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,884 $ 2,572 $ 5,467 $ 4,876
Total long-duration contracts revenue recognition 2,608   4,914  
Total percentage of operating revenues 90.40%   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] $ 358   $ 691  
Percentage of total operating revenues 12.40%   12.60%  
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   $ 4,223  
Percentage of total operating revenues 78.00%   77.20%