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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - Utilities - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 359 | $ 340 | $ 384
Regulatory Liabilities |  |  |
Regulatory liabilities | 345 | 335 | 360
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 10 | 11 | 12
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 28 | 3 | 17
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 39 | 38 | 34
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 262 | 279 | 283
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 6 | 4 | 14
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 94 | 83 | 148
Underfunded pension plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 118 | 114 | 104
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 34 | 37 | 55
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 38 | 32 | 6
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 22 | 22 | 22
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 53 | $ 52 | $ 49

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