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Risk Management Activities and Derivative Transactions (Tables) | 3 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary of Derivative Instruments That Receive Hedge Accounting Treatment | The following tables summarize the accounting treatment that certain of TVA's financial derivative transactions receive:
Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 1) Amount of Mark-to-Market Gain (Loss) Recognized in OCI
|  |  |  |  |  | Three Months Ended December 31,
Derivatives in Cash Flow Hedging Relationship |  | Objective of Hedge Transaction |  | Accounting for Derivative Hedging Instrument |  | 2017 |  | 2016
Currency swaps |  | To protect against changes in cash flows caused by changes in foreign currency exchange rates (exchange rate risk) |  | Unrealized gains and losses are recorded in AOCI and reclassified to interest expense to the extent they are offset by gains and losses on the hedged transaction. |  | $ | 39 |  |  | $ | (8 | )
Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 2)(1) Amount of Gain (Loss) Reclassified from OCI to Interest Expense
|  | Three Months Ended December 31,
Derivatives in Cash Flow Hedging Relationship |  | 2017 |  | 2016
Currency swaps |  | $ | 3 |  |  | $ | (38 | )
Note (1) There were no ineffective portions or amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $1 million of losses from AOCI to interest expense within the next twelve months to offset amounts anticipated to be recorded in interest expense related to net exchange gain on the debt.
Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment |
Summary of Derivative Instruments That Do Not Receive Hedge Accounting Treatment(1) Amount of Gain (Loss) Recognized in Income on Derivatives
|  |  |  |  |  | Three Months Ended December 31,
Derivative Type |  | Objective of Derivative |  | Accounting for Derivative Instrument |  | 2017 |  | 2016
Interest rate swaps |  | To fix short-term debt variable rate to a fixed rate (interest rate risk) |  | Mark-to-market gains and losses are recorded as regulatory assets or liabilities. Realized gains and losses are recognized in interest expense when incurred during the settlement period. |  | $ | (24 | ) |  | $ | (26 | )
Commodity contract derivatives |  | To protect against fluctuations in market prices of purchased coal or natural gas (price risk) |  | Mark-to-market gains and losses are recorded as regulatory assets or liabilities. Realized gains and losses due to contract settlements are recognized in fuel expense as incurred. |  | 3 |  |  | (2 | )
Commodity derivatives under FTP |  | To protect against fluctuations in market prices of purchased commodities (price risk) |  | Mark-to-market gains and losses are recorded as regulatory assets or liabilities. Realized gains and losses are recognized in fuel expense or purchased power expense when the related commodity is used in production. |  | 8 |  |  | (14 | )
Note (1) All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there was no related gain (loss) recognized in income for these unrealized gains (losses) for the three months ended December 31, 2017 and 2016.
Fair Value of TVA Derivatives |
Fair Values of TVA Derivatives
|  | At December 31, 2017 |  | At September 30, 2017
Derivatives That Receive Hedge Accounting Treatment |  | Balance |  | Balance Sheet Presentation |  | Balance |  | Balance Sheet Presentation
Currency swaps |  |  |  |  |  |  |  |
£200 million Sterling |  | $ | (59 | ) |  | Accounts payable and accrued liabilities $(4); Other long-term liabilities $(55) |  | $ | (67 | ) |  | Accounts payable and accrued liabilities $(5); Other long-term liabilities $(62)
£250 million Sterling |  | 1 |  |  | Accounts payable and accrued liabilities $(4); Other long-term assets $5 |  | (15 | ) |  | Accounts payable and accrued liabilities $(4); Other long-term liabilities $(11)
£150 million Sterling |  | (7 | ) |  | Accounts payable and accrued liabilities $(3); Other long-term liabilities $(4) |  | (21 | ) |  | Accounts payable and accrued liabilities $(2); Other long-term liabilities $(19)
|  | At December 31, 2017 |  | At September 30, 2017
Derivatives That Do Not Receive Hedge Accounting Treatment |  | Balance |  | Balance Sheet Presentation |  | Balance |  | Balance Sheet Presentation
Interest rate swaps |  |  |  |  |  |  |  |
$1.0 billion notional |  | (1,052 | ) |  | Accounts payable and accrued liabilities $(64); Other long-term liabilities $(988) |  | (1,093 | ) |  | Accounts payable and accrued liabilities $(66); Other long-term liabilities $(1,027)
$476 million notional |  | (394 | ) |  | Accounts payable and accrued liabilities $(24); Other long-term liabilities $(370) |  | (410 | ) |  | Accounts payable and accrued liabilities $(25); Other long-term liabilities $(385)
$42 million notional |  | (8 | ) |  | Accounts payable and accrued liabilities $(2); Other long-term liabilities $(6) |  | (8 | ) |  | Accounts payable and accrued liabilities $(2); Other long-term liabilities $(6)
Commodity contract derivatives |  | (77 | ) |  | Other current assets $10; Other long-term assets $6; Other long-term liabilities $(35); Accounts payable and accrued liabilities $(58) |  | (60 | ) |  | Other current assets $8; Other long-term assets $2; Other long-term liabilities $(9); Accounts payable and accrued liabilities $(61)
FTP |  |  |  |  |  |  |  |
Derivatives under FTP(1) |  | — |  |  |  |  | (5 | ) |  | Other current assets $(4); Accounts payable and accrued liabilities $(1)
Note (1) Fair values of certain derivatives under the FTP that were in net liability positions totaling $4 million at September 30, 2017, were recorded in TVA's margin cash accounts in Other current assets. These derivatives were transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full. At December 31, 2017, TVA had no derivatives under the FTP in net liability positions.
Commodity Contract Derivatives |
Commodity Contract Derivatives
| At December 31, 2017 |  | At September 30, 2017
| Number of Contracts |  | Notional Amount |  | Fair Value (MtM) |  | Number of Contracts |  | Notional Amount |  | Fair Value (MtM)
Coal contract derivatives | 11 |  | 23 million tons |  | $ | (73 | ) |  | 20 |  | 17 million tons |  | $ | (67 | )
Natural gas contract derivatives | 46 |  | 253 million mmBtu |  | $ | (4 | ) |  | 53 |  | 271 million mmBtu |  | $ | 7 |
Derivatives Under Financial Trading Program |
Derivatives Under Financial Trading Program(1)
| At December 31, 2017 |  | At September 30, 2017
| Notional Amount (in mmBtu) |  | Fair Value (MtM) (in millions) |  | Notional Amount (in mmBtu) |  | Fair Value (MtM) (in millions)
Natural gas |  |  |  |  |  |  |
Swap contracts | — |  |  | $ | — |  |  | 2,800,000 |  |  | $ | (5 | )
Note (1) Fair value amounts presented are based on the net commodity position with the counterparty. Notional amounts disclosed represent the net value of contractual amounts.
Financial Trading Program Unrealized Gains (Losses) | TVA experienced the following unrealized and realized gains and losses related to the FTP at the dates and during the periods, as applicable, set forth in the tables below:
Financial Trading Program Unrealized Gains (Losses)
|  | At December 31, 2017 |  | At September 30, 2017
FTP unrealized gains (losses) deferred as regulatory liabilities (assets) |  |  |  |
Natural gas |  | $ | — |  |  | $ | (5 | )
Financial Trading Program Realized Gains (Losses) |
Financial Trading Program Realized Gains (Losses)
|  | Three Months Ended December 31,
|  | 2017 |  | 2016
Decrease (increase) in fuel expense |  |  |  |
Natural gas |  | $ | (6 | ) |  | $ | (11 | )
Decrease (increase) in purchased power expense |  |  |  |
Natural gas |  | (2 | ) |  | (3 | )
Offsetting Assets and Liabilities | The amounts of TVA's derivative instruments as reported in the consolidated balance sheets at December 31, 2017, and September 30, 2017, are shown in the table below:
Derivative Assets and Liabilities
| At December 31, 2017
| Gross Amounts of Recognized Assets/Liabilities |  | Gross Amounts Offset in the Balance Sheet (1) |  | Net Amounts of Assets/Liabilities Presented in the Balance Sheet (2)
Assets |  |  |  |  |
Currency swaps(3) | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Commodity derivatives not subject to master netting or similar arrangement | $ | 16 |  |  | $ | — |  |  | $ | 16 |
Total assets | $ | 17 |  |  | $ | — |  |  | $ | 17 |
Liabilities |  |  |  |  |
Currency swaps(3) | $ | 66 |  |  | $ | — |  |  | $ | 66 |
Interest rate swaps(3) | 1,454 |  |  | — |  |  | 1,454 |
Total derivatives subject to master netting or similar arrangement | 1,520 |  |  | — |  |  | 1,520 |
Commodity derivatives not subject to master netting or similar arrangement | 93 |  |  | — |  |  | 93 |
Total liabilities | $ | 1,613 |  |  | $ | — |  |  | $ | 1,613 |
| At September 30, 2017
| Gross Amounts of Recognized Assets/Liabilities |  | Gross Amounts Offset in the Balance Sheet(1) |  | Net Amounts of Assets/Liabilities Presented in the Balance Sheet(2)
Assets |  |  |  |  |
Commodity derivatives not subject to master netting or similar arrangement | $ | 10 |  |  | $ | — |  |  | $ | 10 |
Liabilities |  |  |  |  |
Currency swaps(3) | $ | 103 |  |  | $ | — |  |  | $ | 103 |
Interest rate swaps(3) | 1,511 |  |  | — |  |  | 1,511 |
Commodity derivatives under FTP | 5 |  |  | (4 | ) |  | 1 |
Total derivatives subject to master netting or similar arrangement | 1,619 |  |  | (4 | ) |  | 1,615 |
Commodity derivatives not subject to master netting or similar arrangement | 70 |  |  | — |  |  | 70 |
Total liabilities | $ | 1,689 |  |  | $ | (4 | ) |  | $ | 1,685 |
Notes (1) Amounts primarily include counterparty netting of derivative contracts, margin account deposits for futures commission merchants transactions, and cash collateral received or paid in accordance with the accounting guidance for derivatives and hedging transactions. (2) There are no derivative contracts subject to a master netting arrangement or similar agreement that are not offset in the consolidated balance sheets. (3) Letters of credit of approximately $1.0 billion and $1.2 billion were posted as collateral at December 31, 2017, and September 30, 2017, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives.

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