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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Other Long-Term Assets    
EnergyRight® receivables, net $ 63 $ 71
Prepaid Expense, Noncurrent 60 44
Total other long-term assets 401 320
Prepaid Expense, Current 12 12
Loans and Leases Receivable, Allowance 4 4
Financing Receivable, after Allowance for Credit Loss, Current 3  
EnergyRight loan 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 2 2
Economic Development Loan Collective Reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1 1
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight® receivables, net 13 15
Other long-term assets    
Other Long-Term Assets    
Loans and other long-term receivables, net 125 96
EnergyRight® receivables, net 50 57
Other 78 83
Other long-term assets    
Other Long-Term Assets    
Commodity Contract Asset, Noncurrent $ 88 $ 40
Energy Right    
Other Long-Term Assets    
Number of days in default 180 days  
Energy Right | Minimum    
Other Long-Term Assets    
Debt Instrument, Term 5 years  
Energy Right | Maximum    
Other Long-Term Assets    
Debt Instrument, Term 10 years