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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2023
State [Line Items]              
Electric revenue   $ (2,925) $ (2,490)   $ (8,306) $ (7,289)  
Sales of Electricity   2,932 2,491   8,318 7,294  
Off System Sales of Electricity   7     12 5  
Other revenue   $ 38 36   $ 119 109  
Total long duration contract revenue recognition   2,662     7,576    
Revenues   $ 2,970 2,527   $ 8,437 7,403  
Off system sales     1        
Percent of wholesale Credit offered         310.00%    
Percent of Pandemic Credit Offered       2.50% 2.50%    
Pandemic Relief Credit   (56) (52)   $ (161) (156)  
Percent of Generation Flexibility Credit         5.00%    
NES's % of operating revenues         800.00%    
Percent of Generation Flexibility Credit         5.00%    
Forecast              
State [Line Items]              
Revenues             $ 12,400
Percent of Pandemic Credit Offered             1.50%
Pandemic Relief Credit $ 220           $ 230
ALABAMA              
State [Line Items]              
Electric revenue   (419) (359)   $ (1,203) (1,072)  
GEORGIA              
State [Line Items]              
Electric revenue   (69) (60)   (207) (184)  
KENTUCKY              
State [Line Items]              
Electric revenue   (195) (163)   (556) (457)  
MISSISSIPPI              
State [Line Items]              
Electric revenue   (283) (237)   (788) (686)  
NORTH CAROLINA              
State [Line Items]              
Electric revenue   (20) (15)   (63) (49)  
TENNESSEE              
State [Line Items]              
Electric revenue   (1,929) (1,646)   (5,455) (4,810)  
VIRGINIA              
State [Line Items]              
Electric revenue   (10) $ (10)   (34) $ (31)  
20-year Termination Notice [Member]              
State [Line Items]              
Revenues   2,250     6,473    
5-year termination notice [Member]              
State [Line Items]              
Revenues   $ 412     $ 1,103