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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2023
State [Line Items] |  |  |
Electric revenue | $ (2,959) | $ (2,537) |
Sales of Electricity | 2,963 | 2,538 |
Off System Sales of Electricity | 4 |  |
Other revenue | $ 52 | 45 |
Total long duration contract revenue recognition | 2,706 |  |
Revenues | $ 3,015 | 2,583 |
Off system sales |  | 1 |
Percent of wholesale Credit offered | 310.00% |  |
Percent of Pandemic Credit Offered | 2.50% |  |
Pandemic Relief Credit | $ (53) | (50) |
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) | (371) |
GEORGIA |  |  |
State [Line Items] |  |  |
Electric revenue | (76) | (64) |
KENTUCKY |  |  |
State [Line Items] |  |  |
Electric revenue | (198) | (171) |
MISSISSIPPI |  |  |
State [Line Items] |  |  |
Electric revenue | (278) | (241) |
NORTH CAROLINA |  |  |
State [Line Items] |  |  |
Electric revenue | (25) | (20) |
TENNESSEE |  |  |
State [Line Items] |  |  |
Electric revenue | (1,941) | (1,659) |
VIRGINIA |  |  |
State [Line Items] |  |  |
Electric revenue | (13) | $ (11) |
20-year Termination Notice [Member] |  |  |
State [Line Items] |  |  |
Revenues | 2,345 |  |
5-year termination notice [Member] |  |  |
State [Line Items] |  |  |
Revenues | $ 361 |  |

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