Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Name:	us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and Contingencies (Details)	6 Months Ended	12 Months Ended
Commitments and Contingencies (Details)	Mar. 31, 2023 USD ($) subsidiary	Sep. 30, 2017 USD ($) record_of_decision	Mar. 24, 2023 person	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)
Loss Contingencies
Environmental expenditures cap during calendar year	$ 5,000,000
West Reading, Pennsylvania Explosion
Loss Contingencies
Number Of Fatalities \| person			7
Number Of Injuries \| person			11
CPG, PNG and UGI Gas COAs
Loss Contingencies
Accrual for environmental loss contingencies	$ 52,000,000			$ 53,000,000	$ 49,000,000
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