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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | $ 2,830 | $ 2,664 | $ 8,654 | $ 8,551
Electric revenue | (2,828) | (2,662) | (8,651) | (8,542)
Off System Sales of Electricity | 2 | 2 | 6 | 9
Pre-commercial Ops - capitalized revenue | 0 | 0 | (3) | 0
Unregulated Operating Revenue | 49 | 34 | 144 | 121
Regulated and Unregulated Operating Revenue | $ 2,879 | 2,698 | $ 8,798 | $ 8,672
Total long duration contract revenue recognition | 2,596 |  | 7,925 |
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 | $ 409 | 388 | $ 1,274 | $ 1,244
GEORGIA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | 65 | 59 | 214 | 207
KENTUCKY |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | 179 | 172 | 557 | 562
MISSISSIPPI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | 277 | 263 | 816 | 814
NORTH CAROLINA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | 19 | 17 | 70 | 67
TENNESSEE |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | 1,869 | 1,754 | 5,685 | 5,613
VIRGINIA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue | $ 10 | $ 9 | $ 35 | $ 35

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