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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Other Long-Term Assets    
EnergyRight receivables $ 71 $ 86
Prepaid Expense, Noncurrent 44 42
Restricted Cash and Investments, Noncurrent 19 21
Total other long-term assets 320 325
Impact on secured borrowings 1  
Prepaid Expense, Current 12 3
Loans and Leases Receivable, Allowance 4  
Financing Receivable, after Allowance for Credit Loss, Current 3 5
Other Assets, Miscellaneous, Current 77 58
EnergyRight loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1  
Economic development loan collective reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1  
Economic development loan specific loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 2  
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight receivables 15 18
Other long-term assets    
Other Long-Term Assets    
EnergyRight receivables 57 69
Loans and other long-term receivables, net 96 100
Commodity contract derivative assets 40 23
Prepaid capacity payments   11
Other $ 83 $ 91
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