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Segment Information - Corporate and Other segment information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	$ 648	$ 1,398	$ 81
Loss on extinguishment of debt	(11)	0	0
Loss on disposals of Conemaugh and HVAC	0	0	(54)
Corporate & Other
Segment Reporting Information [Line Items]
Loss on extinguishment of debt	(11)
Corporate & Other \| AmeriGas Propane
Segment Reporting Information [Line Items]
Loss on extinguishment of debt	0
Corporate & Other \| AmeriGas Propane \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0	0	0
Corporate & Other \| AmeriGas Propane \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(185)	167	72
Corporate & Other \| AmeriGas Propane \| Other operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0
Corporate & Other \| AmeriGas Propane \| Operating and administrative expenses
Segment Reporting Information [Line Items]
Restructuring costs	(21)	(54)	(44)
Impairment of customer relationship intangible		0
Acquisition and integration expenses associated with the CMG Acquisition			0
Corporate & Other \| AmeriGas Propane \| Other non-operating income (expense), net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0	0	0
Corporate & Other \| AmeriGas Propane \| (Loss) income from equity investees
Segment Reporting Information [Line Items]
Impairments of certain equity method investments and assets	0	0
Corporate & Other \| AmeriGas Propane \| Loss on disposals of Conemaugh and HVAC
Segment Reporting Information [Line Items]
Loss on disposals of Conemaugh and HVAC			0
Corporate & Other \| UGI International
Segment Reporting Information [Line Items]
Loss on extinguishment of debt	(11)
Corporate & Other \| UGI International \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	9	0	0
Corporate & Other \| UGI International \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	797	1,065	0
Corporate & Other \| UGI International \| Other operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	2
Corporate & Other \| UGI International \| Operating and administrative expenses
Segment Reporting Information [Line Items]
Restructuring costs	(9)	(33)	(18)
Impairment of customer relationship intangible		(20)
Acquisition and integration expenses associated with the CMG Acquisition			0
Corporate & Other \| UGI International \| Other non-operating income (expense), net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	50	8	(36)
Corporate & Other \| UGI International \| (Loss) income from equity investees
Segment Reporting Information [Line Items]
Impairments of certain equity method investments and assets	(5)	0
Corporate & Other \| UGI International \| Loss on disposals of Conemaugh and HVAC
Segment Reporting Information [Line Items]
Loss on disposals of Conemaugh and HVAC			0
Corporate & Other \| Midstream & Marketing
Segment Reporting Information [Line Items]
Loss on extinguishment of debt	0
Corporate & Other \| Midstream & Marketing \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(4)	(15)	3
Corporate & Other \| Midstream & Marketing \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(21)	173	42
Corporate & Other \| Midstream & Marketing \| Other operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0
Corporate & Other \| Midstream & Marketing \| Operating and administrative expenses
Segment Reporting Information [Line Items]
Restructuring costs	(1)	0	0
Impairment of customer relationship intangible		0
Acquisition and integration expenses associated with the CMG Acquisition			(2)
Corporate & Other \| Midstream & Marketing \| Other non-operating income (expense), net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0	0	0
Corporate & Other \| Midstream & Marketing \| (Loss) income from equity investees
Segment Reporting Information [Line Items]
Impairments of certain equity method investments and assets	$ (35)	$ (93)
Corporate & Other \| Midstream & Marketing \| Loss on disposals of Conemaugh and HVAC
Segment Reporting Information [Line Items]
Loss on disposals of Conemaugh and HVAC			$ (54)