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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,627 $ 1,348
EnergyRight financing obligation 208 215
Currency swap liabilities 47 [1] 15 [2]
Total other long-term liabilities $ 2,219 1,962
Energy Right Program    
Other Long-Term Liabilities    
Number of days in default 180 days  
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,627 1,348
EnergyRight financing obligation 148 152
Environmental agreements liability 55 108
Currency swap liabilities 47 15
Membership interests of VIE subject to mandatory redemption 35 37
Commodity contract derivative liabilities 17 17
Commodity swap derivative liabilities 10 14
Other 280 271
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
EnergyRight financing obligation $ 37 $ 38
Minimum | Energy Right Program    
Other Long-Term Liabilities    
Debt Instrument, Term 5 years  
Maximum | Energy Right Program    
Other Long-Term Liabilities    
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.