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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, 2022 | Sep. 30, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 384 | $ 397 | $ 398
Regulatory Liabilities |  |  |
Regulatory liabilities | 360 | 388 | 335
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 12 | 13 | 12
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 17 | 36 | 17
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 34 | 32 | 29
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 283 | 287 | 270
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 14 | 20 | 7
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 148 | 143 | 128
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 104 | 108 | 169
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 55 | 58 | 59
Deferred fuel and power costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 6 | 11 | 0
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 22 | 24 | 24
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 49 | $ 53 | $ 18

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