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v3.23.1

Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2023
State [Line Items] |  |  |  |  |
Electric revenue | $ (2,921) | $ (2,844) | $ (5,880) | $ (5,381) |
Sales of Electricity | 2,924 | 2,848 | 5,887 | 5,386 |
Off System Sales of Electricity | 3 |  | 7 | 5 |
Other revenue | $ 35 | 36 | $ 87 | 81 |
Total long duration contract revenue recognition | 2,674 |  | 5,380 |  |
Revenues | $ 2,959 | 2,884 | $ 5,974 | 5,467 |
Off system sales |  | 4 |  |  |
Percent of wholesale Credit offered |  |  | 310.00% |  |
Percent of Pandemic Credit Offered |  |  | 2.50% |  |
Pandemic Relief Credit | (53) | (55) | $ (106) | (105) |
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 | (428) | (413) | $ (856) | (784) |
GEORGIA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (72) | (74) | (148) | (138) |
KENTUCKY |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (192) | (190) | (390) | (361) |
MISSISSIPPI |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (273) | (264) | (551) | (505) |
NORTH CAROLINA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (25) | (23) | (50) | (43) |
TENNESSEE |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (1,918) | (1,867) | (3,859) | (3,526) |
VIRGINIA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (13) | $ (13) | (26) | $ (24) |
20-year Termination Notice [Member] |  |  |  |  |
State [Line Items] |  |  |  |  |
Revenues | 2,323 |  | 4,668 |  |
5-year termination notice [Member] |  |  |  |  |
State [Line Items] |  |  |  |  |
Revenues | $ 351 |  | $ 712 |  |

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