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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
Units
Mar. 31, 2024
USD ($)
Units
Mar. 31, 2023
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]      
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block]   $ 5,919 $ 5,974
Total long-duration contracts revenue recognition 2,842 5,329  
Total percentage of operating revenues 90.10% 90.10%  
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] $ 360 $ 691  
Percentage of total operating revenues 11.40% 11.70%  
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] $ 2,482 $ 4,638  
Percentage of total operating revenues 78.70% 78.40%