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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, 2025 | Sep. 30, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 312 | $ 319 | $ 312
Regulatory Liabilities |  |  |
Regulatory liabilities | 356 | 329 | 347
Postretirement benefits |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 12 | 13 | 11
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 37 | 17 | 34
State income tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 45 | 44 | 44
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 246 | 247 | 250
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 16 | 8 | 8
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 109 | 105 | 93
Underfunded pension plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 104 | 106 | 109
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 25 | 28 | 32
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 4 | 0 | 0
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 29 | 28 | 23
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 41 | $ 52 | $ 55

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