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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2024
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | Components of regulatory assets and regulatory liabilities are summarized in the table below.
Regulatory Assets and Liabilities (in millions)
| At March 31, 2024 |  | At September 30, 2023
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 37 |  |  | $ | 31 |
Unrealized losses on commodity derivatives | 191 |  |  | 136 |
Fuel cost adjustment receivable | 2 |  |  | 11 |
Total current regulatory assets | 230 |  |  | 178 |
Non-current regulatory assets |  |  |
Retirement benefit plans deferred costs | 1,435 |  |  | 1,440 |
Non-nuclear decommissioning costs | 2,985 |  |  | 2,922 |
Unrealized losses on interest rate derivatives | 369 |  |  | 272 |
Nuclear decommissioning costs | 457 |  |  | 728 |
Unrealized losses on commodity derivatives | 80 |  |  | 52 |
Environmental compliance and remediation costs | 62 |  |  | — |
Other non-current regulatory assets | 152 |  |  | 152 |
Total non-current regulatory assets | 5,540 |  |  | 5,566 |
Total regulatory assets | $ | 5,770 |  |  | $ | 5,744 |
Current regulatory liabilities |  |  |
Fuel cost adjustment tax equivalents | $ | 186 |  |  | $ | 201 |
Fuel cost adjustment payable | 11 |  |  | — |
Unrealized gains on commodity derivatives | 10 |  |  | 21 |
Total current regulatory liabilities | 207 |  |  | 222 |
Non-current regulatory liabilities |  |  |
Retirement benefit plans deferred credits | 86 |  |  | 95 |
Unrealized gains on commodity derivatives | 8 |  |  | 12 |
Total non-current regulatory liabilities | 94 |  |  | 107 |
Total regulatory liabilities | $ | 301 |  |  | $ | 329 |
Environmental Compliance and Remediation Costs. TVA uses regulatory accounting for certain amounts associated with compliance with an order, regulation, settlement, or lawsuit, or certain costs associated with environmental remediation activities, including but not limited to those involving environmental cleanup activities and groundwater activities. Costs will be recovered in rates based on the average life of debt financed to fund actual expenditures.

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- Definition Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet or that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. Regulatory liabilities can result from obligations to make refunds to customers or deferral of gains that will be credited to customers in future periods + References No definition available. + Details
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