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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions			$ 372	$ 509
Loss on extinguishment of debt	$ 0	$ 0	(11)	0
AmeriGas Propane
Segment Reporting Information [Line Items]
Loss on extinguishment of debt			0
AmeriGas Propane \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0	0	0	0
AmeriGas Propane \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(46)	59	(83)	123
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		0
AmeriGas Propane \| Other non-operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0	0	0	0
AmeriGas Propane \| Operating and administrative expenses
Segment Reporting Information [Line Items]
Restructuring costs	(1)		(15)
Business transformation expenses		(11)		(37)
AmeriGas Propane \| Loss from equity investees
Segment Reporting Information [Line Items]
Impairments associated with certain equity method investments	0	0	0	0
UGI International
Segment Reporting Information [Line Items]
Loss on extinguishment of debt			(11)
UGI International \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	2	0	7	0
UGI International \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	110	226	458	380
UGI International \| Other operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	6		6
UGI International \| Other non-operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	14	(1)	19	(6)
UGI International \| Operating and administrative expenses
Segment Reporting Information [Line Items]
Restructuring costs	(2)		(4)
Business transformation expenses		(6)		(12)
UGI International \| Loss from equity investees
Segment Reporting Information [Line Items]
Impairments associated with certain equity method investments	0	0	0	0
Midstream & Marketing
Segment Reporting Information [Line Items]
Loss on extinguishment of debt			0
Midstream & Marketing \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(4)	(4)	(6)	(4)
Midstream & Marketing \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(51)	44	(29)	16
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		0
Midstream & Marketing \| Other non-operating income, net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0	0	0	0
Midstream & Marketing \| Operating and administrative expenses
Segment Reporting Information [Line Items]
Restructuring costs	(1)		(1)
Business transformation expenses		0		0
Midstream & Marketing \| Loss from equity investees
Segment Reporting Information [Line Items]
Impairments associated with certain equity method investments	$ (50)	$ (93)	$ (50)	$ (93)