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Other Long-Term Assets Other Long-Term Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Other Long-Term Assets    
EnergyRight receivables $ 162 $ 166
Currency swap assets, net 25 [1] 0 [2]
Total other long-term assets $ 483 483
Energy Right Program    
Other Long-Term Assets    
Number of days in default 180 days  
Other long-term assets    
Other Long-Term Assets    
EnergyRight receivables $ 124 123
Unamortized debt Issue cost of power bonds and variable interest entities 80 68
Loans and other long-term receivables, net 126 87
Coal contract derivative assets 1 0
Prepaid capacity payments 52 58
Currency swap assets, net 25 0
Restricted cash 0 64
Other 75 83
Accounts Receivable [Member]    
Other Long-Term Assets    
EnergyRight receivables $ 32 $ 33
Minimum | Energy Right Program    
Other Long-Term Assets    
Debt Instrument, Term 5 years  
Maximum | Energy Right Program    
Other Long-Term Assets    
Debt Instrument, 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 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 16 — Offsetting of Derivative Assets and Liabilities.
[2] 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 16 — Offsetting of Derivative Assets and Liabilities.