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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, 2022 | Sep. 30, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 371 | $ 397 | $ 396
Regulatory Liabilities |  |  |
Regulatory liabilities | 336 | 388 | 334
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 12 | 13 | 12
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 1 | 36 | 21
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 34 | 32 | 30
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 281 | 287 | 269
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 8 | 20 | 2
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 151 | 143 | 131
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 103 | 108 | 166
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 34 | 58 | 58
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 14 | 11 | 0
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 22 | 24 | 24
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 47 | $ 53 | $ 17

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