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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - Utilities - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 350 | $ 340 | $ 371
Regulatory Liabilities |  |  |
Regulatory liabilities | 376 | 335 | 336
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 10 | 11 | 12
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 63 | 3 | 1
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 40 | 38 | 34
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 260 | 279 | 281
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 3 | 4 | 8
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 95 | 83 | 151
Underfunded pension plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 118 | 114 | 103
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 28 | 37 | 34
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 30 | 32 | 14
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 22 | 22 | 22
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 57 | $ 52 | $ 47

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