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Commitments and Contingencies (Details) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) subsidiary | Sep. 30, 2017 USD ($) record_of_decision | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
Loss Contingencies |  |  |  |
Environmental expenditures cap during calendar year | $ 5,000,000 |  |  |
CPG, PNG and UGI Gas COAs |  |  |  |
Loss Contingencies |  |  |  |
Accrual for environmental loss contingencies | $ 49,000,000 |  | $ 50,000,000 | $ 50,000,000
Utilities |  |  |  |
Loss Contingencies |  |  |  |
Number of subsidiaries acquired with similar histories | subsidiary | 2 |  |  |
AmeriGas OLP | Saranac Lake, New York | NYDEC ROD |  |  |  |
Loss Contingencies |  |  |  |
Accrual for environmental loss contingencies | $ 8,000,000 |  |  |
Loss contingency, number of remediation plans | record_of_decision |  | 3 |  |
Estimated remediation plan cost |  | $ 28,000,000 |  |

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