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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - UGI Utilities, Inc. - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 319 | $ 347
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 329 | 366
Postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 13 | 12
Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 17 | 55
State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 44 | 43
Excess federal deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 247 | 254
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 8 | 2
Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 105 | 94
Underfunded pension plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 106 | 111
Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 28 | 28
Deferred fuel and power costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 0 | 27
Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 28 | 23
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 52 | $ 64

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