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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
State [Line Items]    
Electric revenue $ (2,732) $ (2,959)
Off System Sales of Electricity 2  
Regulated and Unregulated Operating Revenue $ 2,765 3,015
Total long duration contract revenue recognition 2,487  
Off system sales   4
Percent of wholesale Credit offered 310.00%  
Percent of Generation Flexibility Credit 5.00%  
Pre-commercial Ops - capitalized revenue $ (3) 0
Regulated Operating Revenue $ 2,731 2,963
NES's % of operating revenues 800.00%  
Percent of Generation Flexibility Credit 5.00%  
ALABAMA    
State [Line Items]    
Regulated Operating Revenue $ 408 428
GEORGIA    
State [Line Items]    
Regulated Operating Revenue 69 76
KENTUCKY    
State [Line Items]    
Regulated Operating Revenue 177 198
MISSISSIPPI    
State [Line Items]    
Regulated Operating Revenue 255 278
NORTH CAROLINA    
State [Line Items]    
Regulated Operating Revenue 23 25
TENNESSEE    
State [Line Items]    
Regulated Operating Revenue 1,789 1,941
VIRGINIA    
State [Line Items]    
Regulated Operating Revenue $ 11 $ 13