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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | $ 2,876 | $ 2,731
Electric revenue | (2,875) | (2,732)
Off System Sales of Electricity | 1 | 2
Pre-commercial Ops - capitalized revenue | 0 | 3
Unregulated Operating Revenue | 44 | 34
Regulated and Unregulated Operating Revenue | $ 2,920 | $ 2,765
Total long duration contract revenue recognition | 2,616 |
Percent of wholesale Credit offered | 310.00% |
Percent of Generation Flexibility Credit | 5.00% |
NES's % of operating revenues | 800.00% | 800.00%
Percent of Generation Flexibility Credit | 5.00% |
MLGW's % of operating revenues | 800.00% | 800.00%
ALABAMA |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | $ 431 | $ 408
GEORGIA |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | 74 | 69
KENTUCKY |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | 182 | 177
MISSISSIPPI |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | 269 | 255
NORTH CAROLINA |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | 21 | 23
TENNESSEE |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | 1,886 | 1,789
VIRGINIA |  |
Disaggregation of Revenue [Line Items] |  |
Regulated Operating Revenue | $ 12 | $ 11

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