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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2023 | Oct. 29, 2022 | Sep. 15, 2022 | Jan. 28, 2022 | Nov. 09, 2021 | Feb. 08, 2021 | Oct. 08, 2020 | Jan. 28, 2020 | Oct. 27, 2018 | Oct. 19, 2016 | Sep. 30, 2022 | Sep. 30, 2021
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  | 20 years |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  | 10 years |  |  |  |  |
Requested rate increase |  |  |  |  |  | $ 9,000,000 |  | $ 75,000,000 |  |  |  |
Approved rate increase, amount |  |  |  |  | $ 6,000,000 |  | $ 20,000,000 |  |  |  |  |
Property, plant and equipment, net threshold |  |  |  |  |  |  | 2,875,000,000 |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas | Beginning January 1, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  |  |  |  |  |  | 10,000,000 |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas | Beginning July 1, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase |  |  |  | $ 83,000,000 |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Joint Petition for Approval of Settlement |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public utilities |  |  |  | 5 years |  |  |  |  |  |  |  |
Weather condition rate |  |  | 3.00% |  |  |  |  |  |  |  |  |
Property, plant and equipment, net threshold |  |  | $ 3,368,000 |  |  |  |  |  |  |  |  |
Approved rate increase, amount |  |  | $ 49,000,000 |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Joint Petition for Approval of Settlement, Phase I | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase |  | $ 38,000,000 |  |  |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Regulated natural gas utilities | Joint Petition for Approval of Settlement, Phase II | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |
Postretirement benefits |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liability, amortization period |  |  |  |  |  |  |  |  |  | 10 years |  |
Regulated natural gas utilities |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 35,000,000
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  |  |  |  |  |  |  |  | 1 year |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Average remaining depreciable lives of the associated property |  |  |  |  |  |  |  |  |  |  | 65 years |
Maximum | Removal Costs, Net |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  |  |  |  |  |  |  | 5 years |

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