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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Other Long-Term Assets    
EnergyRight receivables $ 62 $ 71
Prepaid Expense, Noncurrent 74 44
Restricted Cash and Investments, Noncurrent 20 19
Total other long-term assets 394 320
Prepaid Expense, Current 12  
Loans and Leases Receivable, Allowance 3 4
Financing Receivable, after Allowance for Credit Loss, Current 6 3
Other Assets, Miscellaneous, Current 85 77
EnergyRight loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1 1
Economic development loan collective reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1 1
Economic development loan specific loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1 2
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight receivables 13 15
Other long-term assets    
Other Long-Term Assets    
EnergyRight receivables 49 57
Loans and other long-term receivables, net 99 96
Commodity contract derivative assets 102 40
Other $ 70 $ 83
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