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Other Long-Term Assets Other Long-Term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Other Long-Term Assets      
Restricted Cash   $ 12 $ 1
Loans and other long-term receivables   10  
EnergyRight receivables $ 100 112  
Total other long-term assets 325 362  
Accounts Receivable [Member]      
Other Long-Term Assets      
EnergyRight receivables 20 22  
Other long-term assets      
Other Long-Term Assets      
EnergyRight receivables 81 90  
Loans and other long-term receivables, net 125 125  
Commodity contract derivative assets 1 31  
Restricted Cash and Investments, Noncurrent 23 23  
Prepaid capacity payments 19 27  
Other $ 77 $ 66  
Energy Right      
Other Long-Term Assets      
Number of days in default 180 days    
Minimum | Energy Right      
Other Long-Term Assets      
EnergyRight loan terms 5 years    
Maximum | Energy Right      
Other Long-Term Assets      
EnergyRight loan terms 10 years