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v3.21.2

Revenue Customer Type (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) Units | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) Units | Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |  |
MLGW's % of operating revenues |  |  | 800.00% | 900.00% |
NES's % of operating revenues |  |  | 800.00% | 800.00% |
Sales of Electricity | $ 2,491 | $ 2,216 | $ 7,294 | $ 7,237 |
Electric revenue | 2,490 | 2,215 | 7,289 | 7,234 |
Off System Sales of Electricity | 1 |  | 5 | 3 |
Other revenue | 36 | 35 | 109 | 113 |
Revenues | 2,527 | 2,251 | 7,403 | 7,350 |
Bill credits for LTA | $ (43) | (38) | $ (133) | (108) |
Number of LPCs signed LTA | Units | 142 |  | 142 |  |
Number of LPCs signed Flexibility Agreement | Units | 71 |  | 71 |  |
Percent of sales of electricity to LPCs |  |  | 92.00% |  |
Pandemic Relief Credit | $ (52) |  | $ (156) |  |
Number of LPCs signed LTA by Filing Date | Units | 143 |  | 143 |  |
Forecast |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Pandemic Relief Credit |  |  |  |  | $ 200
lpcs [Domain] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | $ 2,283 | 2,058 | $ 6,711 | 6,716 |
industries directly served [Domain] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 179 | 132 | 501 | 442 |
federal agencies and other [Domain] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 29 | 26 | 82 | 79 |
ALABAMA |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 359 | 312 | 1,072 | 1,041 |
GEORGIA |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 60 | 52 | 184 | 179 |
KENTUCKY |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 163 | 140 | 457 | 455 |
MISSISSIPPI |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 237 | 204 | 686 | 668 |
NORTH CAROLINA |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 15 | 13 | 49 | 50 |
TENNESSEE |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | 1,646 | 1,485 | 4,810 | 4,809 |
VIRGINIA |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Electric revenue | $ 10 | $ 9 | $ 31 | $ 32 |

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