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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
State [Line Items] |  |  |  |
Electric revenue | $ (2,531) | $ (2,488) | $ (4,799) | $ (5,019)
Sales of Electricity | 2,533 | 2,489 | 4,803 | 5,021
Off System Sales of Electricity | 2 |  | 4 | 2
Other revenue | $ 39 | 32 | $ 73 | 78
Total long duration contract revenue recognition | 2,337 |  | 4,428 |
Revenues | $ 2,572 | 2,521 | $ 4,876 | 5,099
Off system sales |  | 1 |  |
Percent of wholesale Credit offered |  |  | 310.00% |
Percent of Pandemic Credit Offered |  |  | 250.00% |
ALABAMA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (379) | (360) | $ (713) | (729)
GEORGIA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (66) | (64) | (124) | (127)
KENTUCKY |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (157) | (158) | (294) | (315)
MISSISSIPPI |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (237) | (227) | (449) | (464)
NORTH CAROLINA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (18) | (19) | (34) | (37)
TENNESSEE |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (1,663) | (1,648) | (3,164) | (3,324)
VIRGINIA |  |  |  |
State [Line Items] |  |  |  |
Electric revenue | (11) | $ (12) | (21) | $ (23)
20-year Termination Notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Revenues | 1,934 |  | 3,654 |
5-year termination notice [Member] |  |  |  |
State [Line Items] |  |  |  |
Revenues | $ 403 |  | $ 774 |

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