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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Other Long-Term Assets    
EnergyRight® receivables, net $ 82 $ 86
Prepaid Expense, Noncurrent 47 42
Restricted Cash and Cash Equivalents 20 21
Total other long-term assets 320 325
Prepaid Expense, Current 5 3
Deferral of EnergyRight loans 1  
Loans and Leases Receivable, Allowance 5 1
EnergyRight loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 2  
Economic development loan specific loan reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 2  
Economic Development Loan Collective Reserve    
Other Long-Term Assets    
Loans and Leases Receivable, Allowance 1  
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight® receivables, net 17 18
Other long-term assets    
Other Long-Term Assets    
Loans and other long-term receivables, net 104 100
EnergyRight® receivables, net 65 69
Prepaid capacity payments 10 11
Other 61 59
Other long-term assets    
Other Long-Term Assets    
Commodity Contract Asset, Noncurrent $ 13 $ 23
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