Face (par) amount of debt instrument at time of issuance.

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

Debt (Details) $ in Millions		3 Months Ended		6 Months Ended
Debt (Details) $ in Millions	Dec. 07, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 07, 2021 EUR (€)
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 0	$ 0	$ 11	$ 0
Senior Notes \| UGI International
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 11
Senior Notes \| UGI International \| 2.50% Senior notes due December 2029
Debt Instrument [Line Items]
Principal amount \| €						€ 400,000,000
Interest rate						2.50%
Senior Notes \| UGI International \| 3.25% Senior notes due November 2025
Debt Instrument [Line Items]
Interest rate						3.25%