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Other Long-Term Assets Other Long-Term Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Energy Right Program
Sep. 30, 2014
Other Noncurrent Assets [Member]
Sep. 30, 2013
Other Noncurrent Assets [Member]
Sep. 30, 2014
Accounts Receivable [Member]
Sep. 30, 2013
Accounts Receivable [Member]
Other Long-Term Assets              
EnergyRight receivables $ 166 $ 150   $ 123 $ 117 $ 33 $ 33
Unamortized debt Issue cost of power bonds       68 75    
Loans and other long-term receivables, net 92 73   87 73    
Coal contract derivative assets       0 1    
Prepaid capacity payments       58 62    
Currency swap assets, net 0 28   0 28    
Restricted cash       64 0    
Other       83 89    
Total other long-term assets $ 483 $ 445          
Number of days in default     180 days