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Risk Management Activities and Derivative Transactions (Tables) | 6 Months Ended
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Mar. 31, 2019
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 Accumulated Other Comprehensive Income (Loss)
|  |  |  |  |  | Three Months Ended March 31 |  | Six Months Ended March 31 |
Derivatives in Cash Flow Hedging Relationship |  | Objective of Hedge Transaction |  | Accounting for Derivative Hedging Instrument |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
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 |  | $ | 23 |  |  | $ | 44 |  |  | $ | (29 | ) |  | $ | 83 |  |
Summary of Derivative Instruments That Receive Hedge Accounting Treatment (part 2) Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income to Interest Expense(1)
|  | Three Months Ended March 31 |  | Six Months Ended March 31 |
Derivatives in Cash Flow Hedging Relationship |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Currency swaps |  | $ | 14 |  |  | $ | 28 |  |  | $ | (4 | ) |  | $ | 31 |  |
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 $40 million of gains from AOCI to interest expense within the next 12 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 Amount of Gain (Loss) Recognized in Income on Derivatives(1)
|  |  |  |  |  | Three Months Ended March 31 |  | Six Months Ended March 31 |
Derivative Type |  | Objective of Derivative |  | Accounting for Derivative Instrument |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
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 |  | $ | (19 | ) |  | $ | (23 | ) |  | $ | (39 | ) |  | $ | (47 | ) |
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 |  |  | — |  |  | — |  |
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 | ) |
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 and six months ended March 31, 2019 and 2018.
Fair Value of TVA Derivatives |
Fair Values of TVA Derivatives
| At March 31, 2019 |  | At September 30, 2018
Derivatives That Receive Hedge Accounting Treatment:
| Balance |  | Balance Sheet Presentation |  | Balance |  | Balance Sheet Presentation
Currency swaps |  |  |  |  |  |  |
£200 million Sterling | $ | (72 | ) |  | Accounts payable and accrued liabilities $(5); Other long-term liabilities $(67) |  | $ | (67 | ) |  | Accounts payable and accrued liabilities $(5); Other long-term liabilities $(62)
£250 million Sterling | (25 | ) |  | Accounts payable and accrued liabilities $(5); Other long-term liabilities $(20) |  | (12 | ) |  | Accounts payable and accrued liabilities $(5); Other long-term liabilities $(7)
£150 million Sterling | (26 | ) |  | Accounts payable and accrued liabilities $(3); Other long-term liabilities $(23) |  | (15 | ) |  | Accounts payable and accrued liabilities $(3); Other long-term liabilities $(12)
Derivatives That Do Not Receive Hedge Accounting Treatment:
| Balance |  | Balance Sheet Presentation |  | Balance |  | Balance Sheet Presentation
Interest rate swaps |  |  |  |  |  |  |
$1.0 billion notional | $ | (1,020 | ) |  | Accounts payable and accrued liabilities $(56); Other long-term liabilities $(964) |  | $ | (878 | ) |  | Accounts payable and accrued liabilities $(56); Other long-term liabilities $(822)
$476 million notional | (383 | ) |  | Accounts payable and accrued liabilities $(20); Other long-term liabilities $(363) |  | (317 | ) |  | Accounts payable and accrued liabilities $(20); Other long-term liabilities $(297)
$42 million notional | (5 | ) |  | Accounts payable and accrued liabilities $(2); Other long-term liabilities $(3) |  | (4 | ) |  | Accounts payable and accrued liabilities $(1); Other long-term liabilities $(3)
Commodity contract derivatives | 28 |  |  | Other current assets $32; Other long-term assets $10; Other long-term liabilities $(7); Accounts payable and accrued liabilities $(7) |  | 60 |  |  | Other current assets $41; Other long-term assets $31; Other long-term liabilities $(8); Accounts payable and accrued liabilities $(4)
Commodity Contract Derivatives |
Commodity Contract Derivatives
| At March 31, 2019 |  | At September 30, 2018
| Number of Contracts |  | Notional Amount |  | Fair Value (MtM) |  | Number of Contracts |  | Notional Amount |  | Fair Value (MtM)
Coal contract derivatives | 16 |  | 15 million tons |  | $ | 38 |  |  | 13 |  | 20 million tons |  | $ | 58 |
Natural gas contract derivatives | 42 |  | 360 million mmBtu |  | $ | (10 | ) |  | 61 |  | 359 million mmBtu |  | $ | 2 |
Financial Trading Program Realized Gains (Losses) | TVA experienced the following realized losses related to the FTP during the periods set forth in the table below:
Financial Trading Program Realized Gains (Losses)
|  | Three Months Ended March 31 |  | Six Months Ended March 31 |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Decrease (increase) in fuel expense |  |  |  |  |  |  |  |  |
Natural gas |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (6 | ) |
Decrease (increase) in purchased power expense |  |  |  |  |  |  |  |  |
Natural gas |  | — |  |  | — |  |  | — |  |  | (2 | ) |
Offsetting Assets and Liabilities | The amounts of TVA's derivative instruments as reported in the Consolidated Balance Sheets at March 31, 2019, and September 30, 2018, are shown in the table below:
Derivative Assets and Liabilities
| At March 31, 2019
| 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 | $ | 42 |  |  | $ | — |  |  | $ | 42 |
Liabilities |  |  |  |  |
Currency swaps(3) | $ | 123 |  |  | $ | — |  |  | $ | 123 |
Interest rate swaps(3) | 1,408 |  |  | — |  |  | 1,408 |
Total derivatives subject to master netting or similar arrangement | 1,531 |  |  | — |  |  | 1,531 |
Commodity derivatives not subject to master netting or similar arrangement | 14 |  |  | — |  |  | 14 |
Total liabilities | $ | 1,545 |  |  | $ | — |  |  | $ | 1,545 |
| At September 30, 2018
| 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 | $ | 72 |  |  | $ | — |  |  | $ | 72 |
Liabilities |  |  |  |  |
Currency swaps(3) | $ | 94 |  |  | $ | — |  |  | $ | 94 |
Interest rate swaps(3) | 1,199 |  |  | — |  |  | 1,199 |
Total derivatives subject to master netting or similar arrangement | 1,293 |  |  | — |  |  | 1,293 |
Commodity derivatives not subject to master netting or similar arrangement | 12 |  |  | — |  |  | 12 |
Total liabilities | $ | 1,305 |  |  | $ | — |  |  | $ | 1,305 |
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 $932 million and $921 million were posted as collateral at March 31, 2019, and September 30, 2018, 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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