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Regulatory Assets and Liabilities (Tables) | 9 Months Ended
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Jun. 30, 2023
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 June 30, 2023 |  | At September 30, 2022
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 32 |  |  | $ | 47 |
Unrealized losses on commodity derivatives | 180 |  |  | 14 |
Fuel cost adjustment receivable | 24 |  |  | 77 |
Total current regulatory assets | 236 |  |  | 138 |
Non-current regulatory assets |  |  |
Retirement benefit plans deferred costs | 1,746 |  |  | 1,839 |
Non-nuclear decommissioning costs | 2,638 |  |  | 2,856 |
Unrealized losses on interest rate derivatives | 473 |  |  | 479 |
Nuclear decommissioning costs | 592 |  |  | 821 |
Unrealized losses on commodity derivatives | 78 |  |  | 1 |
Other non-current regulatory assets | 139 |  |  | 138 |
Total non-current regulatory assets | 5,666 |  |  | 6,134 |
Total regulatory assets | $ | 5,902 |  |  | $ | 6,272 |
Current regulatory liabilities |  |  |
Fuel cost adjustment tax equivalents | $ | 203 |  |  | $ | 218 |
Unrealized gains on commodity derivatives | 21 |  |  | 173 |
Total current regulatory liabilities | 224 |  |  | 391 |
Non-current regulatory liabilities |  |  |
Retirement benefit plans deferred credits | 58 |  |  | 70 |
Unrealized gains on commodity derivatives | 1 |  |  | 102 |
Total non-current regulatory liabilities | 59 |  |  | 172 |
Total regulatory liabilities | $ | 283 |  |  | $ | 563 |

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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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