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v3.20.2

Revenue Customer Type (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) Units | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) Units | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2004 USD ($)
Electric revenue |  |  |  |  |  |  |  |  | $ 10,104 | $ 11,159 | $ 11,075 |
Other revenue |  |  |  |  |  |  |  |  | 145 | 159 | 158 |
Revenues | $ 2,899 | $ 2,251 | $ 2,521 | $ 2,578 | $ 3,239 | $ 2,604 | $ 2,750 | $ 2,725 | $ 10,249 | 11,318 | 11,233 |
Percent of sales of electricity to LPCs |  |  |  |  |  |  |  |  | 93.00% |  |  |
Bill credits for LTA |  |  |  |  |  |  |  |  | $ (163) | (14) | 0 |
Number of LPCs signed LTA | Units | 142 |  |  |  |  |  |  |  | 142 |  |  |
Percentage of total operating revenues |  |  |  |  |  |  |  |  | 91.80% |  |  |
Total number of LPCs | Units | 153 |  |  |  |  |  |  |  | 153 |  |  |
Number of LPCs signed Flexibility Agreement | Units | 64 |  |  |  |  |  |  |  | 64 |  |  |
Revenue Capitalized During Pre-Commercial Operations |  |  |  |  |  |  |  |  | $ 0 | $ 0 | (11) |
MLGW's % of operating revenues |  |  |  |  |  |  |  |  | 9.00% |  |  |
NES's % of operating revenues |  |  |  |  |  |  |  |  | 8.00% |  |  |
MLGW prepayment |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
20-year contract arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total operating revenues |  |  |  |  |  |  |  |  | 74.80% |  |  |
5-year contract arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of LPCs signed LTA | Units | 11 |  |  |  |  |  |  |  | 11 |  |  |
Percentage of total operating revenues |  |  |  |  |  |  |  |  | 17.00% |  |  |
MLGW |  |  |  |  |  |  |  |  |  |  |  |
Deferred Revenue, Description |  |  |  |  |  |  |  |  | 10 million | 100 million |  | 100 million
TENNESSEE |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | $ 6,740 | $ 7,419 | 7,350 |
VIRGINIA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 42 | 45 | 48 |
NORTH CAROLINA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 65 | 74 | 66 |
MISSISSIPPI |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 941 | 1,063 | 1,052 |
KENTUCKY |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 624 | 691 | 696 |
GEORGIA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 249 | 270 | 267 |
ALABAMA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 1,439 | 1,593 | 1,600 |
Federal agencies and other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 110 | 122 | 129 |
20-year contract arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 7,666 |  |  |
5-year contract arrangement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 1,740 |  |  |
Local Power Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 9,406 | 10,351 | 10,262 |
Industries Directly Served [Member] |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | 588 | 686 | 695 |
Capitalized revenue during pre-commercial plant operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 11 |

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