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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - Utilities - USD ($) $ in Millions | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 393 | $ 340 | $ 412
Regulatory Liabilities |  |  |
Regulatory liabilities | 320 | 335 | 346
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 11 | 11 | 13
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 3 | 3 | 1
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 39 | 38 | 33
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 264 | 279 | 285
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 3 | 4 | 14
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 93 | 83 | 145
Underfunded pension plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 114 | 114 | 106
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 36 | 37 | 57
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 71 | 32 | 29
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 25 | 22 | 23
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 54 | $ 52 | $ 52

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