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Revenue (Details) - USD ($)
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Other revenue $ 169,000,000 $ 146,000,000 $ 145,000,000
Off-system sales 19,000,000 7,000,000 4,000,000
Sales of Electricity (subtotal) 12,352,000,000 10,350,000,000 10,100,000,000
Electric revenue (12,371,000,000) (10,357,000,000) (10,104,000,000)
Revenues 12,540,000,000 10,503,000,000 10,249,000,000
Pandemic Relief Credit (228,000,000) (221,000,000)  
Revenue Not from Contract with Customer $ 0.015    
Revenue from Contract with Customer [Abstract]      
Percent of Pandemic Credit Offered 2.50%    
ALABAMA      
Electric revenue $ (1,778,000,000) (1,508,000,000) (1,439,000,000)
GEORGIA      
Electric revenue (299,000,000) (254,000,000) (249,000,000)
KENTUCKY      
Electric revenue (821,000,000) (655,000,000) (624,000,000)
MISSISSIPPI      
Electric revenue (1,182,000,000) (984,000,000) (941,000,000)
NORTH CAROLINA      
Electric revenue (87,000,000) (66,000,000) (65,000,000)
TENNESSEE      
Electric revenue (8,137,000,000) (6,841,000,000) (6,740,000,000)
VIRGINIA      
Electric revenue $ (48,000,000) $ (42,000,000) $ (42,000,000)