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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2023
USD ($)
Units
Long-term Contract for Purchase of Electric Power [Line Items]  
Total long-duration contracts revenue recognition | $ 2,487
Total percentage of operating revenues 90.00%
Number of LPCs signed LTA | Units 147
Total Number of LPCs | Units 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] | $ $ 331
Percentage of total operating revenues 12.00%
Number of LPCs signed LTA | Units 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] | $ $ 2,156
Percentage of total operating revenues 78.00%