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Commitments and Contingencies - Contingencies (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 record_of_decision | Dec. 31, 2008 lb | Dec. 31, 2007 lb | Sep. 30, 2020 USD ($) subsidiary | Sep. 30, 2019 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Environmental expenditures cap during year |  |  |  | $ 5 |  |
Amount of propane in cylinders being sold | lb |  |  | 17 |  |  |
Reduced amount of propane in cylinders being sold | lb |  | 15 |  |  |  |
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 |  |  |  | $ 53 | $ 50 |
UGI Utilities | 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 |  |
Number of records of decisions drafted | record_of_decision | 3 |  |  |  |  |
Estimated remediation plan cost |  |  |  |  |  | $ 28

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