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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Other Long-Term Assets    
EnergyRight® receivables $ 90 $ 100
Prepaid Expense, Noncurrent 39 22
Restricted Cash and Cash Equivalents 23 23
Total other long-term assets 339 325
Prepaid Expense, Current 4 5
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight® receivables 18 20
Other long-term assets    
Other Long-Term Assets    
Loans and other long-term receivables, net 128 125
EnergyRight® receivables 73 81
Prepaid capacity payments 13 19
Other $ 63 $ 55
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