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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Other Long-Term Assets    
EnergyRight receivables $ 163 $ 166
Currency swap asset, net [1] 61 0
Total other long-term assets $ 531 483
Energy Right Program    
Other Long-Term Assets    
Number of days in default 180 days  
Other long-term assets    
Other Long-Term Assets    
EnergyRight receivables $ 123 123
Unamortized debt issue cost of power bonds and variable interest entities 75 68
Loans and other long-term receivables, net 108 87
Prepaid capacity payments 53 58
Restricted cash 0 64
Currency swap asset, net 61 0
Commodity contract derivative assets 1 0
Other 110 83
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight receivables $ 32 $ 33
Minimum | Energy Right Program    
Other Long-Term Assets    
EnergyRight loan term 5 years  
Maximum | Energy Right Program    
Other Long-Term Assets    
EnergyRight loan term 10 years  
[1] Due to the right of setoff and method of settlement, TVA elects to record commodity derivatives under the FTP based on its net commodity position with the counterparty or FCM. Deposits are made to TVA's margin cash accounts held with each FCM to offset any net liability positions in full for derivatives that are transacted with FCMs. TVA records currency swaps net of any cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 15 — Offsetting of Derivative Assets and Liabilities.