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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Other Long-Term Assets    
EnergyRight® receivables $ 94 $ 100
Prepaid Expense, Noncurrent 33 22
Restricted Cash and Cash Equivalents 23 23
Total other long-term assets 332 325
Prepaid Expense, Current 1 5
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight® receivables 19 20
Other long-term assets    
Other Long-Term Assets    
Loans and other long-term receivables, net 126 125
EnergyRight® receivables 76 81
Prepaid capacity payments 15 19
Other $ 59 55
Restricted Cash and Cash Equivalents, Noncurrent   $ 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