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v3.21.2

Revenue Local Power Company Contracts (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 USD ($) Units | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Number of LPCs signed LTA | Units | 145 |  |
Electric revenue | $ 10,357 | $ 10,104 | $ 11,159
Total number of LPCs | Units | 153 |  |
Percentage of total operating revenues | 90.70% |  |
Percent of op revenues of LPCs who filed complaint with FERC | 3.00% |  |
Percent of wholesale Credit offered | 3.10% |  |
20-year contract arrangement [Member] |  |  |
Electric revenue | $ 7,987 |  |
5-year contract arrangement [Member] |  |  |
Electric revenue | 1,547 |  |
Local Power Company [Member] |  |  |
Electric revenue | $ 9,534 | $ 9,406 | $ 10,351
5-year contract arrangement [Member] |  |  |
Number of LPCs signed LTA | Units | 8 |  |
Percentage of total operating revenues | 14.70% |  |

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- Definition Revenue from sales of electricity + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of LPCs signed LTA + References No definition available. + Details
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- Definition Percent of op revenues of LPCs who filed complaint with FERC + References No definition available. + Details
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- Definition Percent of wholesale Credit offered + References No definition available. + Details
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- Definition Percentage of total operating revenues + References No definition available. + Details
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- Definition Total number of LPCs + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |