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Revenue Local Power Company Contracts (Details) $ in Millions | 3 Months Ended
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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% |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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