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Other Long-Term Assets Other Long-Term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Other Long-Term Assets    
EnergyRight receivables $ 86 $ 100
Prepaid Expense, Noncurrent 42 22
Restricted Cash and Investments, Noncurrent 21 23
Total other long-term assets 325 325
Impact on secured borrowings 1  
Prepaid Expense, Current 3 5
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight receivables 18 20
Other long-term assets    
Other Long-Term Assets    
EnergyRight receivables 69 81
Loans and other long-term receivables, net 100 125
Commodity contract derivative assets 23 0
Restricted Cash and Investments, Noncurrent   23
Prepaid capacity payments 11 19
Other $ 59 $ 55
Energy Right    
Other Long-Term Assets    
Number of days in default 180 days  
Minimum | Energy Right    
Other Long-Term Assets    
EnergyRight loan terms 5 years  
Maximum | Energy Right    
Other Long-Term Assets    
EnergyRight loan terms 10 years