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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Other Long-Term Assets    
Loans and other long-term receivables, net $ 109 $ 97
EnergyRight® receivables, net 53 55
Other Intangible Assets, Net 31 15
Prepaid Expense, Noncurrent 52 64
Prepaid capital assets 9 28
Total other long-term assets 335 330
Prepaid Expense, Current 9 25
Loans and Leases Receivable, Allowance 2 3
Financing Receivable, after Allowance for Credit Loss, Current 11 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 0 1
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight® receivables, net 12 12
Other long-term assets    
Other Long-Term Assets    
EnergyRight® receivables, net 44 47
Other 81 67
Other current assets    
Other Long-Term Assets    
Other Intangible Assets, Net 9 7
Other long-term assets    
Other Long-Term Assets    
Commodity Contract Asset, Noncurrent $ 9 $ 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