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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2023
State [Line Items]      
Electric revenue $ (2,959) $ (2,537)  
Sales of Electricity 2,963 2,538  
Off System Sales of Electricity 4    
Other revenue $ 52 45  
Total long duration contract revenue recognition 2,706    
Revenues $ 3,015 2,583  
Off system sales   1  
Percent of wholesale Credit offered 310.00%    
Percent of Pandemic Credit Offered 2.50%    
Pandemic Relief Credit $ (53) (50)  
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]      
Pandemic Relief Credit     $ 230
ALABAMA      
State [Line Items]      
Electric revenue $ (428) (371)  
GEORGIA      
State [Line Items]      
Electric revenue (76) (64)  
KENTUCKY      
State [Line Items]      
Electric revenue (198) (171)  
MISSISSIPPI      
State [Line Items]      
Electric revenue (278) (241)  
NORTH CAROLINA      
State [Line Items]      
Electric revenue (25) (20)  
TENNESSEE      
State [Line Items]      
Electric revenue (1,941) (1,659)  
VIRGINIA      
State [Line Items]      
Electric revenue (13) $ (11)  
20-year Termination Notice [Member]      
State [Line Items]      
Revenues 2,345    
5-year termination notice [Member]      
State [Line Items]      
Revenues $ 361