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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 08, 2020 | Jan. 28, 2020 | Oct. 11, 2019 | Jan. 28, 2019 | Oct. 27, 2018 | Oct. 25, 2018 | Oct. 19, 2016 | Sep. 30, 2020 | Sep. 30, 2019
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  |  |  | 20 years |  |  |  |
UGI Gas |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Public utilities, tax benefits, effective period |  |  |  | 12 months |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Public utilities, requested rate increase (decrease), amount |  | $ 75,000,000 |  | $ 71,000,000 |  |  |  |  |
Approved rate increase (decrease), amount |  |  | $ 30,000,000 |  |  |  |  |  |
Energy Efficiency and Conservation and Growth extension tariff, extension term |  |  | 5 years |  |  |  |  |  |
Tax benefit to be returned |  |  |  | $ 24,000,000 |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory asset, amortization period | 10 years |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 20,000,000 |  |  |  |  |  |  |  |
Property, plant and equipment, net threshold | 2,875,000,000 |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas | Beginning January 1, 2021 | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | 10,000,000 |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | UGI Gas | Beginning July 1, 2021 | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount | $ 10,000,000 |  |  |  |  |  |  |  |
Pennsylvania Public Utility Commission | Electric Utility |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  | $ 3,000,000 |  |  |
Postretirement benefit overcollections |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Regulatory liability, amortization period |  |  |  |  |  |  | 10 years |  |
Gas Utility |  |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |
Fair value of unrealized gains (losses) |  |  |  |  |  |  |  | $ 8,000,000 | $ (2,000,000)
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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