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Revenue Local Power Company Contracts (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2021
USD ($)
Units
Dec. 31, 2020
USD ($)
Long-term Contract for Purchase of Electric Power [Line Items]    
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 2,583 $ 2,304
Total long-duration contracts revenue recognition 2,306  
Total percentage of operating revenues 89.30%  
Number of LPCs signed LTA | Units 146  
Total Number of LPCs | Units 153  
Percent of op revenues of LPCs who filed complaint with FERC 100.00%  
5-year Termination Notice [Member]    
Long-term Contract for Purchase of Electric Power [Line Items]    
Long-Duration Contracts Revenue Recognition, Policy [Policy Text Block] $ 333  
Percentage of total operating revenues 12.90%  
Number of LPCs signed LTA | Units 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] $ 1,973  
Percentage of total operating revenues 76.40%