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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, 2024 | Sep. 30, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 311 | $ 347 | $ 350
Regulatory Liabilities |  |  |
Regulatory liabilities | 341 | 366 | 376
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 11 | 12 | 10
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 33 | 55 | 63
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 44 | 43 | 40
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 248 | 254 | 260
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 5 | 2 | 3
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 91 | 94 | 95
Underfunded pension plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 109 | 111 | 118
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 28 | 28 | 28
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 0 | 27 | 30
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 26 | 23 | 22
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 57 | $ 64 | $ 57

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