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Revenue (Details)
 3 Months Ended
Dec. 31, 2019
USD ($)
percent
number_of_local_power_companies
Dec. 31, 2018
USD ($)
State [Line Items]    
Electric revenue $ (2,531,000,000) $ (2,681,000,000)
Sales of Electricity 2,532,000,000 2,681,000,000
Off System Sales of Electricity 1,000,000 0
Other revenue $ 46,000,000 44,000,000
Total number of customers 154  
Total long duration contract revenue recognition 2,357,000,000  
Total number of customers that represent a percent of sales | percent 1  
Revenues $ 2,578,000,000 2,725,000,000
ALABAMA    
State [Line Items]    
Electric revenue (369,000,000) (392,000,000)
GEORGIA    
State [Line Items]    
Electric revenue (63,000,000) (67,000,000)
KENTUCKY    
State [Line Items]    
Electric revenue (157,000,000) (168,000,000)
MISSISSIPPI    
State [Line Items]    
Electric revenue (237,000,000) (251,000,000)
NORTH CAROLINA    
State [Line Items]    
Electric revenue (18,000,000) (20,000,000)
TENNESSEE    
State [Line Items]    
Electric revenue (1,676,000,000) (1,771,000,000)
VIRGINIA    
State [Line Items]    
Electric revenue $ (11,000,000) $ (12,000,000)
20-year Termination Notice [Member]    
State [Line Items]    
Number of customers | number_of_local_power_companies 134  
Number of customers that represent the percent of sales | percent 1  
Revenues $ 1,471,000,000  
10-year Termination Notice [Member]    
State [Line Items]    
Number of customers | number_of_local_power_companies 4  
Number of customers that represent the percent of sales | percent 0  
Revenues $ 214,000,000  
5-year termination notice [Member]    
State [Line Items]    
Number of customers | number_of_local_power_companies 16  
Number of customers that represent the percent of sales | percent 0  
Revenues $ 672,000,000