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Regulatory Assets and Liabilities (Tables) | 3 Months Ended
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Dec. 31, 2021
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
| At December 31, 2021 |  | At September 30, 2021
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 109 |  |  | $ | 114 |
Unrealized losses on commodity derivatives | 5 |  |  | 3 |
Fuel cost adjustment receivable | 49 |  |  | 79 |
Total current regulatory assets | 163 |  |  | 196 |
Non-current regulatory assets |  |  |
Deferred pension costs and other post-retirement benefits costs | 3,592 |  |  | 3,668 |
Non-nuclear decommissioning costs | 2,696 |  |  | 2,653 |
Unrealized losses on interest rate derivatives | 1,143 |  |  | 1,122 |
Nuclear decommissioning costs | 218 |  |  | 363 |
Unrealized losses on commodity derivatives | 1 |  |  | — |
Other non-current regulatory assets | 143 |  |  | 150 |
Total non-current regulatory assets | 7,793 |  |  | 7,956 |
Total regulatory assets | $ | 7,956 |  |  | $ | 8,152 |
Current regulatory liabilities |  |  |
Fuel cost adjustment tax equivalents | $ | 137 |  |  | $ | 130 |
Unrealized gains on commodity derivatives | 86 |  |  | 210 |
Total current regulatory liabilities | 223 |  |  | 340 |
Non-current regulatory liabilities |  |  |
Unrealized gains on commodity derivatives | 25 |  |  | 40 |
Total non-current regulatory liabilities | 25 |  |  | 40 |
Total regulatory liabilities | $ | 248 |  |  | $ | 380 |

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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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