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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) | Oct. 08, 2020 | Jan. 28, 2020 | Oct. 11, 2019 | Jan. 28, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
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UGI Gas |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |
Public utilities, tax benefits, effective period |  |  | 12 months |  |  |  |
UGI Gas | PAPUC |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  | $ 75,000,000 |  | $ 71,000,000 |  |  |
Public utilities, approved rate increase (decrease), amount | $ 20,000,000 |  | $ 30,000,000 |  |  |  |
Property, plant and equipment, net threshold | $ 2,875,000,000 |  |  |  |  |  |
Amortization period | 10 years |  |  |  |  |  |
Tax benefit to be returned, period |  |  | 5 years |  |  |  |
Tax benefit to be returned |  |  |  | $ 24,000,000 |  |  |
UGI Gas | PAPUC | Beginning January 1, 2021 |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), amount | $ 10,000,000 |  |  |  |  |  |
UGI Gas | PAPUC | Beginning July 1, 2021 |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), amount | $ 10,000,000 |  |  |  |  |  |
Gas Utility |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  | $ (1,000,000) | $ 8,000,000 | $ (3,000,000)

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