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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)