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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) - UGI Utilities - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Regulatory Assets |  |  |
Regulatory assets | $ 396 | $ 397 | $ 399
Regulatory Liabilities |  |  |
Regulatory liabilities | 334 | 353 | 358
Postretirement benefit overcollections |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 12 | 13 | 13
Deferred fuel and power refunds |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 21 | 29 | 28
State tax benefits — distribution system repairs |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 30 | 28 | 29
PAPUC temporary rates order |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 0 | 7 | 10
Excess federal deferred income taxes |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 269 | 274 | 275
Other |  |  |
Regulatory Liabilities |  |  |
Regulatory liabilities | 2 | 2 | 3
Income taxes recoverable |  |  |
Regulatory Assets |  |  |
Regulatory assets | 131 | 124 | 133
Underfunded pension and postretirement plans |  |  |
Regulatory Assets |  |  |
Regulatory assets | 166 | 175 | 169
Environmental costs |  |  |
Regulatory Assets |  |  |
Regulatory assets | 58 | 61 | 62
Removal costs, net |  |  |
Regulatory Assets |  |  |
Regulatory assets | 24 | 26 | 22
Other |  |  |
Regulatory Assets |  |  |
Regulatory assets | $ 17 | $ 11 | $ 13

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