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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
State [Line Items] |  |  |  |  |
Electric revenue | $ (2,537) | $ (2,268) |  |  |
Sales of Electricity | 2,538 | 2,270 |  |  |
Off System Sales of Electricity | 1 |  |  |  |
Other revenue | $ 45 | 34 |  |  |
Total long duration contract revenue recognition | 2,306 |  |  |  |
Revenues | $ 2,583 | 2,304 |  |  |
Off system sales |  | 2 |  |  |
Percent of wholesale Credit offered | 310.00% |  |  |  |
Percent of Pandemic Credit Offered | 2.50% |  |  |  | 2.50%
Pandemic Relief Credit | $ (50) | (49) |  |  |
NES's % of operating revenues | 800.00% |  |  |  |
Forecast |  |  |  |  |
State [Line Items] |  |  |  |  |
Percent of Pandemic Credit Offered |  |  | 1.50% |  |
Pandemic Relief Credit |  |  | $ 133 | $ 220 |
ALABAMA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | $ (371) | (334) |  |  |
GEORGIA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (64) | (58) |  |  |
KENTUCKY |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (171) | (137) |  |  |
MISSISSIPPI |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (241) | (212) |  |  |
NORTH CAROLINA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (20) | (16) |  |  |
TENNESSEE |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (1,659) | (1,501) |  |  |
VIRGINIA |  |  |  |  |
State [Line Items] |  |  |  |  |
Electric revenue | (11) | $ (10) |  |  |
20-year Termination Notice [Member] |  |  |  |  |
State [Line Items] |  |  |  |  |
Revenues | 1,973 |  |  |  |
5-year termination notice [Member] |  |  |  |  |
State [Line Items] |  |  |  |  |
Revenues | $ 333 |  |  |  |

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