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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
State [Line Items]        
Electric revenue $ (2,490) $ (2,215) $ (7,289) $ (7,234)
Sales of Electricity 2,491 2,216 7,294 7,237
Off System Sales of Electricity 1   5 3
Other revenue $ 36 35 $ 109 113
Total long duration contract revenue recognition 2,283   6,711  
Revenues $ 2,527 2,251 $ 7,403 $ 7,350
Off system sales   1    
Percent of wholesale Credit offered     310.00%  
Percent of Pandemic Credit Offered     250.00%  
NES's % of operating revenues     800.00% 800.00%
ALABAMA        
State [Line Items]        
Electric revenue (359) (312) $ (1,072) $ (1,041)
GEORGIA        
State [Line Items]        
Electric revenue (60) (52) (184) (179)
KENTUCKY        
State [Line Items]        
Electric revenue (163) (140) (457) (455)
MISSISSIPPI        
State [Line Items]        
Electric revenue (237) (204) (686) (668)
NORTH CAROLINA        
State [Line Items]        
Electric revenue (15) (13) (49) (50)
TENNESSEE        
State [Line Items]        
Electric revenue (1,646) (1,485) (4,810) (4,809)
VIRGINIA        
State [Line Items]        
Electric revenue (10) $ (9) (31) $ (32)
20-year Termination Notice [Member]        
State [Line Items]        
Revenues 1,851   5,505  
5-year termination notice [Member]        
State [Line Items]        
Revenues $ 432   $ 1,206