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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Dec. 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 December 31, 2024 |  | At September 30, 2024
Current regulatory assets |  |  |
Unrealized losses on commodity derivatives | $ | 55 |  |  | $ | 102 |
Unrealized losses on interest rate derivatives | 46 |  |  | 54 |
Fuel cost adjustment receivable | 9 |  |  | 35 |
Total current regulatory assets | 110 |  |  | 191 |
Non-current regulatory assets |  |  |
Non-nuclear decommissioning costs | 6,202 |  |  | 6,187 |
Retirement benefit plans deferred costs | 1,959 |  |  | 1,979 |
Nuclear decommissioning costs | 440 |  |  | 362 |
Unrealized losses on interest rate derivatives | 282 |  |  | 447 |
Environmental compliance and remediation costs | 215 |  |  | 215 |
Unrealized losses on commodity derivatives | 32 |  |  | 64 |
Other non-current regulatory assets | 157 |  |  | 154 |
Total non-current regulatory assets | 9,287 |  |  | 9,408 |
Total regulatory assets | $ | 9,397 |  |  | $ | 9,599 |
Current regulatory liabilities |  |  |
Fuel cost adjustment tax equivalents | $ | 169 |  |  | $ | 169 |
Unrealized gains on commodity derivatives | 17 |  |  | 5 |
Total current regulatory liabilities | 186 |  |  | 174 |
Non-current regulatory liabilities |  |  |
Retirement benefit plans deferred credits | 77 |  |  | 81 |
Unrealized gains on commodity derivatives | 1 |  |  | 2 |
Total non-current regulatory liabilities | 78 |  |  | 83 |
Total regulatory liabilities | $ | 264 |  |  | $ | 257 |

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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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