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Regulatory Assets and Liabilities Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Sep. 30, 2022
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 September 30 (in millions)
| 2022 |  | 2021
Current regulatory assets |  |  |
Unrealized losses on interest rate derivatives | $ | 47 |  |  | $ | 114 |
Unrealized losses on commodity derivatives | 14 |  |  | 3 |
Fuel cost adjustment receivable | 77 |  |  | 79 |
Total current regulatory assets | 138 |  |  | 196 |
Non-current regulatory assets |  |  |
Retirement benefit plans deferred costs | 1,839 |  |  | 3,668 |
Non-nuclear decommissioning costs | 2,856 |  |  | 2,653 |
Unrealized losses on interest rate derivatives | 479 |  |  | 1,122 |
Nuclear decommissioning costs | 821 |  |  | 363 |
Unrealized losses on commodity derivatives | 1 |  |  | — |
Other non-current regulatory assets | 138 |  |  | 150 |
Total non-current regulatory assets | 6,134 |  |  | 7,956 |
Total regulatory assets | $ | 6,272 |  |  | $ | 8,152 |
Current regulatory liabilities |  |  |
Fuel cost adjustment tax equivalents | $ | 218 |  |  | $ | 130 |
Unrealized gains on commodity derivatives | 173 |  |  | 210 |
Total current regulatory liabilities | 391 |  |  | 340 |
Non-current regulatory liabilities |  |  |
Retirement benefit plans deferred credits | 70 |  |  | — |
Unrealized gains on commodity derivatives | 102 |  |  | 40 |
Total non-current regulatory liabilities | 172 |  |  | 40 |
Total regulatory liabilities | $ | 563 |  |  | $ | 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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