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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities Associated with Utilities (Details) - UGI Utilities, Inc. - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 340 | $ 319
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 314 | 329
Postretirement benefits |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 14 | 13
Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 4 | 17
State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 49 | 44
Excess federal deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 239 | 247
Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 8 | 8
Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 113 | 105
Underfunded pension plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 100 | 106
Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 22 | 28
Deferred fuel and power costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 39 | 0
Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 30 | 28
Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 36 | $ 52

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