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Regulatory Assets and Liabilities | 6 Months Ended
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Mar. 31, 2020
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Regulatory Assets and Liabilities Regulatory assets generally represent incurred costs that have been deferred because such costs are probable of future recovery in customer rates. Regulatory liabilities generally represent obligations to make refunds to customers for previous collections for costs that are not likely to be incurred or deferral of gains that will be credited to customers in future periods. Components of regulatory assets and regulatory liabilities are summarized in the table below:
Regulatory Assets and Liabilities(1)
| At March 31, 2020 |  | At September 30, 2019
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 109 |  |  | $ | 89 |
Unrealized losses on commodity derivatives | 52 |  |  | 39 |
Fuel cost adjustment receivable | — |  |  | 28 |
Total current regulatory assets | 161 |  |  | 156 |
Non-current regulatory assets |  |  |  |  |
Deferred pension costs and other post-retirement benefits costs | 4,602 |  |  | 4,756 |
Non-nuclear decommissioning costs | 1,859 |  |  | 1,741 |
Nuclear decommissioning costs | 1,200 |  |  | 868 |
Unrealized losses on interest rate derivatives | 1,615 |  |  | 1,241 |
Unrealized losses on commodity contracts | 8 |  |  | 15 |
Other non-current regulatory assets | 149 |  |  | 142 |
Total non-current regulatory assets | 9,433 |  |  | 8,763 |
Total regulatory assets | $ | 9,594 |  |  | $ | 8,919 |
Current regulatory liabilities |  |  |  |  |
Fuel cost adjustment tax equivalents | $ | 131 |  |  | $ | 138 |
Fuel cost adjustment | 72 |  |  | — |
Unrealized gains on commodity derivatives | 4 |  |  | 12 |
Total current regulatory liabilities | $ | 207 |  |  | $ | 150 |
Note (1) Amounts for Non-current regulatory liabilities were less than $1 million at March 31, 2020, and September 30, 2019, and are therefore not represented in the table above. Due to recent higher volatility in the financial markets associated with the COVID-19 pandemic, TVA experienced unrealized losses related to its investment portfolios and derivative instruments for the six months ended March 31, 2020. TVA does not recognize unrealized gains and losses from the investment portfolios and derivative instruments within earnings but rather defers all such gains and losses within a regulatory liability or asset in accordance with its accounting policy. See Note 14 — Risk Management Activities and Derivative Transactions and Note 15 — Fair Value Measurements.

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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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