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Commitments and Contingencies - Contingencies (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) record_of_decision | Sep. 30, 2023 USD ($) subsidiary | Mar. 24, 2023 person | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Environmental expenditures cap during year |  | $ 5 |  |  |
Damage from Fire, Explosion or Other Hazard |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of fatalities | person |  |  | 7 |  |
Number of injuries | person |  |  | 11 |  |
CPG, PNG and UGI Gas COAs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA |  | $ 52 |  | $ 53 |
UGI Utilities, Inc. | CPG and PNG |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of subsidiaries acquired with similar histories | subsidiary |  | 2 |  |  |
AmeriGas OLP | Saranac Lake, New York | New York State Department of Environment Conservation Remediation Plan |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued liabilities for environmental investigation and remediation costs related to CPG-COA and PNG-COA |  |  |  | $ 8 | $ 8
Number of records of decisions drafted | record_of_decision | 3 |  |  |  |
Estimated remediation plan cost | $ 28 |  |  |  |

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