Debt - UGI International (Details) $ in Millions		12 Months Ended
	Dec. 07, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 07, 2021 EUR (€)
Debt Instrument [Line Items]
Loss on extinguishments of debt		$ 11	$ 0	$ 0
UGI International LLC | Senior Notes | 2.50% Senior Notes due December 2029
Debt Instrument [Line Items]
Aggregate principal amount | €					€ 400,000,000
Stated interest rate (as a percentage)					2.50%
UGI International LLC | Senior Notes | 3.25% Senior Notes Due November 2025
Debt Instrument [Line Items]
Stated interest rate (as a percentage)					3.25%
Loss on extinguishments of debt	$ 11