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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Other Long-Term Assets    
Loans and other long-term receivables, net $ 101 $ 97
EnergyRight® receivables, net 55 55
Prepaid Expense, Noncurrent 44 64
Prepaid capital assets 21 28
Total other long-term assets 312 330
Prepaid Expense, Current 10 25
Loans and Leases Receivable, Allowance 3 3
Financing Receivable, after Allowance for Credit Loss, Current 4 7
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 1 1
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 12
Other long-term assets    
Other Long-Term Assets    
EnergyRight® receivables, net 46 47
Other 88 82
Other long-term assets    
Other Long-Term Assets    
Commodity Contract Asset, Noncurrent $ 12 $ 12
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