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Other Long-Term Liabilities Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,199 $ 1,511
Capital lease obligations 263 302
Currency swap liabilities 94 [1] 103 [2]
EnergyRight financing obligation 143 161
Non-current regulatory liabilities 104 25
Total other long-term liabilities 2,715 3,055
Interest Rate Swap    
Other Long-Term Liabilities    
EnergyRight financing obligation 77 93
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swap liabilities 1,122 1,418
Gallatin coal combustion residual facilities 862 880
Capital lease obligations 178 182
Currency swap liabilities 81 92
EnergyRight financing obligation 102 115
Environmental agreements liability 11 13
Membership interests of VIE subject to mandatory redemption 28 30
Commodity contract derivative liabilities 8 9
Other 323 316
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Gallatin coal combustion residual facilities 30  
EnergyRight financing obligation $ 25 $ 29
[1] 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 15 — 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 15 — Offsetting of Derivative Assets and Liabilities.