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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Aug. 09, 2013
Other Long-Term Liabilities      
Interest rate swap liabilities $ 1,419 $ 1,348  
EnergyRight® financing obligation 209 215  
Currency swap liabilities [1] 23 15  
Total other long-term liabilities 2,019 1,962  
Percentage of membership interests issued     100.00%
Membership interests of VIE subject to mandatory redemption, interest rate, stated percentage     7.00%
Membership interests of VIE subject to mandatory redemption $ 47 50 $ 40
SCCG balloon payment     $ 4
Energy Right Program      
Other Long-Term Liabilities      
Number of days in default 180 days    
Other Noncurrent Liabilities [Member]      
Other Long-Term Liabilities      
Interest rate swap liabilities $ 1,419 1,348  
Environmental agreements liability 63 108  
EnergyRight® financing obligation 149 152  
Membership interests of VIE subject to mandatory redemption 36 37  
Commodity contract derivative liabilities 29 17  
Currency swap liabilities 23 15  
Commodity swap derivative liabilities 11 14  
Other 289 271  
Accounts payable and accrued liabilities      
Other Long-Term Liabilities      
EnergyRight® financing obligation 37 38  
Current portion of membership interests of VIE subject to mandatory redemption $ 2 $ 2  
Minimum | Energy Right Program      
Other Long-Term Liabilities      
EnergyRight loan term 5 years    
Maximum | Energy Right Program      
Other Long-Term Liabilities      
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.