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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Other Long-Term Liabilities    
Gallatin coal combustion residual facilities estimated cost relocate onsite $ 900  
Interest rate swap liabilities 1,454 $ 1,511
Capital lease obligations 301 302
Currency swap liabilities [1] 66 103
Commodity contract derivative liabilities 156 161
Total other long-term liabilities 2,961 3,055
Other long-term liabilities    
Other Long-Term Liabilities    
Interest rate swap liabilities 1,364 1,418
Capital lease obligations 181 182
Currency swap liabilities 59 92
Commodity contract derivative liabilities 112 115
Membership interests of VIE subject to mandatory redemption 30 30
Commodity contract derivative liabilities 35 9
Environmental agreements liability 12 13
Other 293 316
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Accrued Environmental Loss Contingencies, Current 23 19
Interest rate swap liabilities 90 93
Commodity contract derivative liabilities $ 28 $ 29
[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 13 — Offsetting of Derivative Assets and Liabilities.