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Revenue (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
percent
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
percent
Jun. 30, 2019
USD ($)
State [Line Items]        
Electric revenue $ (2,215) $ (2,563) $ (7,234) $ (7,955)
Sales of Electricity 2,216 2,565 7,237 7,958
Off System Sales of Electricity 1 2 3 3
Other revenue $ 35 39 $ 113 121
Total long duration contract revenue recognition 2,058   6,716  
Revenues $ 2,251 2,604 $ 7,350 8,079
Off system sales   2    
ALABAMA        
State [Line Items]        
Electric revenue (312) (367) (1,041) (1,146)
GEORGIA        
State [Line Items]        
Electric revenue (52) (59) (179) (196)
KENTUCKY        
State [Line Items]        
Electric revenue (140) (157) (455) (498)
MISSISSIPPI        
State [Line Items]        
Electric revenue (204) (250) (668) (751)
NORTH CAROLINA        
State [Line Items]        
Electric revenue (13) (15) (50) (56)
TENNESSEE        
State [Line Items]        
Electric revenue (1,485) (1,705) (4,809) (5,273)
VIRGINIA        
State [Line Items]        
Electric revenue (9) $ (10) (32) $ (35)
20-year Termination Notice [Member]        
State [Line Items]        
Revenues $ 1,630   $ 5,399  
10-year Termination Notice [Member]        
State [Line Items]        
Number of customers that represent the percent of sales | percent 0   0  
Revenues $ 1   $ 1  
5-year termination notice [Member]        
State [Line Items]        
Revenues $ 427   $ 1,316