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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) | Jul. 19, 2021 | Feb. 08, 2021 | Oct. 08, 2020 | Jan. 28, 2020 | Oct. 11, 2019 | Jan. 28, 2019 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020
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PAPUC | UGI Electric |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  | $ 9,000,000 |  |  |  |  |  |  |
PAPUC | UGI Electric | Joint Petition | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount | $ 6,000,000 |  |  |  |  |  |  |  |
PAPUC | UGI Gas |  |  |  |  |  |  |  |  |
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 |  |  |  |
Effective period |  |  |  |  | 12 months |  |  |  |
PAPUC | UGI Gas | Beginning January 1, 2021 |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |
Public utilities, approved rate increase (decrease), amount |  |  | $ 10,000,000 |  |  |  |  |  |
PAPUC | UGI Gas | 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) |  |  |  |  |  |  | $ 9,000,000 | $ 8,000,000 | $ 1,000,000

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