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Other Long-Term Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Other Long-Term Assets    
EnergyRight receivables $ 147 $ 162
Currency swap asset, net 0 [1] 25 [2]
Total other long-term assets 431 403
Other long-term assets    
Other Long-Term Assets    
EnergyRight receivables 114 124
Loans and other long-term receivables, net 168 126
Prepaid capacity payments 46 52
Currency swap asset, net 0 25
Commodity contract derivative assets 4 1
Other 99 75
Accounts Receivable    
Other Long-Term Assets    
EnergyRight receivables $ 29 $ 32
Energy Right    
Other Long-Term Assets    
Number of days in default 180 days  
Energy Right | Minimum    
Other Long-Term Assets    
EnergyRight loan term 5 years  
Energy Right | Maximum    
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 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 12 — 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 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 12 — Offsetting of Derivative Assets and Liabilities.