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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Other Long-Term Assets    
EnergyRight® receivables $ 97 $ 100
Prepaid Expense, Noncurrent 29 22
Restricted Cash and Cash Equivalents 23 23
Total other long-term assets 334 325
Prepaid Expense, Current 7 5
Other long-term assets    
Other Long-Term Assets    
Loans and other long-term receivables, net 129 125
EnergyRight® receivables 78 81
Prepaid capacity payments 17 19
Other 58 55
Restricted Cash and Cash Equivalents, Noncurrent   $ 23
Accounts Receivable    
Other Long-Term Assets    
EnergyRight® receivables $ 20  
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