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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
State [Line Items]        
Electric revenue $ (3,091) $ (2,921) $ (5,823) $ (5,880)
Off System Sales of Electricity 2   4 7
Regulated and Unregulated Operating Revenue $ 3,154 2,959 $ 5,919 5,974
Total long duration contract revenue recognition 2,842   5,329  
Off system sales   3    
Percent of wholesale Credit offered     310.00%  
Percent of Generation Flexibility Credit     5.00%  
Pre-commercial Ops - capitalized revenue $ 0 0 $ (3) 0
Regulated Operating Revenue 3,093 2,924 $ 5,824 5,887
NES's % of operating revenues     800.00%  
Percent of Generation Flexibility Credit     5.00%  
ALABAMA        
State [Line Items]        
Regulated Operating Revenue 457 428 $ 865 856
GEORGIA        
State [Line Items]        
Regulated Operating Revenue 80 72 149 148
KENTUCKY        
State [Line Items]        
Regulated Operating Revenue 201 192 378 390
MISSISSIPPI        
State [Line Items]        
Regulated Operating Revenue 284 273 539 551
NORTH CAROLINA        
State [Line Items]        
Regulated Operating Revenue 28 25 51 50
TENNESSEE        
State [Line Items]        
Regulated Operating Revenue 2,027 1,918 3,816 3,859
VIRGINIA        
State [Line Items]        
Regulated Operating Revenue $ 14 $ 13 $ 25 $ 26