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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019
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Regulatory Assets [Line Items] |  |
Regulatory assets | $ 0 | $ 0
UGI Utilities |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 397,000,000 | 396,000,000
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 353,000,000 | 359,000,000
UGI Utilities | Postretirement benefit overcollections |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 13,000,000 | 15,000,000
UGI Utilities | Deferred fuel and power refunds |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 29,000,000 | 6,000,000
UGI Utilities | State income tax benefits — distribution system repairs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 28,000,000 | 25,000,000
UGI Utilities | PAPUC Temporary Rates Order |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 7,000,000 | 31,000,000
UGI Utilities | Excess federal deferred income taxes |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 274,000,000 | 280,000,000
UGI Utilities | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory liabilities | 2,000,000 | 2,000,000
UGI Utilities | Income taxes recoverable |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 124,000,000 | 115,000,000
UGI Utilities | Underfunded pension and postretirement plans |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 175,000,000 | 179,000,000
UGI Utilities | Environmental costs |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 61,000,000 | 60,000,000
UGI Utilities | Removal costs, net |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 26,000,000 | 28,000,000
UGI Utilities | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 11,000,000 | $ 14,000,000

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