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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Other revenue |  |  |  |  |  |  |  |  |  | $ 145 | $ 159 | $ 158
Off-system sales |  |  |  |  |  |  |  |  |  | 4 | 4 | 7
Sales of Electricity (subtotal) |  |  |  |  |  |  |  |  |  | 10,100 | 11,155 | 11,079
Electric revenue |  |  |  |  |  |  |  |  |  | (10,104) | (11,159) | (11,075)
Revenue Capitalized During Pre-Commercial Operations |  |  |  |  |  |  |  |  |  | 0 | 0 | 11
Revenues | $ 2,899 | $ 2,251 | $ 2,521 | $ 2,578 | $ 3,239 | $ 2,604 | $ 2,750 | $ 2,725 |  | 10,249 | 11,318 | 11,233
Pandemic Relief Credit |  |  |  |  |  |  |  |  | $ 200 |  |  |
ALABAMA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | (1,439) | (1,593) | (1,600)
GEORGIA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | (249) | (270) | (267)
KENTUCKY |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | (624) | (691) | (696)
MISSISSIPPI |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | (941) | (1,063) | (1,052)
NORTH CAROLINA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | (65) | (74) | (66)
TENNESSEE |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | (6,740) | (7,419) | (7,350)
VIRGINIA |  |  |  |  |  |  |  |  |  |  |  |
Electric revenue |  |  |  |  |  |  |  |  |  | $ (42) | $ (45) | $ (48)

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