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v3.23.2

Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2023
State [Line Items] |  |  |  |  |
Electric revenue | $ (2,662) | $ (2,925) | $ (8,542) | $ (8,306) |
Sales of Electricity | 2,664 | 2,932 | 8,551 | 8,318 |
Off System Sales of Electricity | 2 |  | 9 | 12 |
Other revenue | $ 34 | 38 | $ 121 | 119 |
Total long duration contract revenue recognition | 2,431 |  | 7,811 |  |
Revenues | $ 2,698 | 2,970 | $ 8,672 | 8,437 |
Off system sales |  | 7 |  |  |
Percent of wholesale Credit offered |  |  | 310.00% |  |
Percent of Pandemic Credit Offered |  |  | 2.50% |  |
Pandemic Relief Credit | (52) | (56) | $ (158) | (161) |
Percent of Generation Flexibility Credit |  |  | 5.00% |  |
NES's % of operating revenues |  |  | 800.00% |  |
Percent of Generation Flexibility Credit |  |  | 5.00% |  |
Forecast |  |  |  |  |
State [Line Items] |  |  |  |  |
Pandemic Relief Credit |  |  |  |  | $ 230
ALABAMA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (388) | (419) | $ (1,244) | (1,203) |
GEORGIA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (59) | (69) | (207) | (207) |
KENTUCKY |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (172) | (195) | (562) | (556) |
MISSISSIPPI |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (263) | (283) | (814) | (788) |
NORTH CAROLINA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (17) | (20) | (67) | (63) |
TENNESSEE |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (1,754) | (1,929) | (5,613) | (5,455) |
VIRGINIA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (9) | $ (10) | (35) | $ (34) |
20-year Termination Notice [Member] |  |  |  |  |
State [Line Items] |  |  |  |  |
Revenues | 2,073 |  | 6,741 |  |
5-year termination notice [Member] |  |  |  |  |
State [Line Items] |  |  |  |  |
Revenues | $ 358 |  | $ 1,070 |  |

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