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Regulatory Assets and Liabilities (Tables) | 6 Months Ended
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Mar. 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 March 31, 2021 |  | At September 30, 2020
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 114 |  |  | $ | 114 |
Unrealized losses on commodity derivatives | — |  |  | 4 |
Fuel cost adjustment receivable | 41 |  |  | 12 |
Total current regulatory assets | 155 |  |  | 130 |
Non-current regulatory assets |  |  |
Deferred pension costs and other post-retirement benefits costs | 5,009 |  |  | 5,193 |
Non-nuclear decommissioning costs | 2,604 |  |  | 2,512 |
Unrealized losses on interest rate derivatives | 986 |  |  | 1,506 |
Nuclear decommissioning costs | 482 |  |  | 896 |
Unrealized losses on commodity derivatives | 4 |  |  | — |
Other non-current regulatory assets | 145 |  |  | 138 |
Total non-current regulatory assets | 9,230 |  |  | 10,245 |
Total regulatory assets | $ | 9,385 |  |  | $ | 10,375 |
Current regulatory liabilities |  |  |
Fuel cost adjustment tax equivalents | $ | 115 |  |  | $ | 115 |
Unrealized gains on commodity derivatives | 26 |  |  | 26 |
Total current regulatory liabilities | 141 |  |  | 141 |
Non-current regulatory liabilities |  |  |
Unrealized gains on commodity derivatives | 5 |  |  | 23 |
Total regulatory liabilities | $ | 146 |  |  | $ | 164 |

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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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