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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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-Topic 946
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Paragraph 5A
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-Publisher FASB
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Segment Information - Reconciliation of Partnership Adjusted EBITDA (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions			$ 107	$ (54)
Midstream & Marketing
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions		$ 0		0
Restructuring costs		0		0
AmeriGas operations enhancement for growth project		0		0
Costs associated with exit of the UGI International energy marketing business		0		0
Impairment of assets		0		0
Midstream & Marketing \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	$ (1)		(2)	1
Costs associated with exit of the UGI International energy marketing business				0
Midstream & Marketing \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	26	41	85	(6)
Midstream & Marketing \| Other operating expense (income), net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions		0	0	0
Interest income from intersegment loan	0		0
Midstream & Marketing \| Operating and administrative expenses/Other operating expense (income), net
Segment Reporting Information [Line Items]
Costs associated with exit of the UGI International energy marketing business				0
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
UGI International
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions		1		(19)
Restructuring costs		(34)		(34)
AmeriGas operations enhancement for growth project		0		0
Costs associated with exit of the UGI International energy marketing business		(2)		(28)
Impairment of assets		(7)		(7)
UGI International \| Revenues
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	0		0	1
Costs associated with exit of the UGI International energy marketing business				(42)
UGI International \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	(8)	53	4	12
UGI International \| Other operating expense (income), net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions		1	1	(2)
Interest income from intersegment loan	3		3
UGI International \| Operating and administrative expenses/Other operating expense (income), net
Segment Reporting Information [Line Items]
Costs associated with exit of the UGI International energy marketing business				(10)
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	(13)		9
AmeriGas Propane
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions		0		0
Restructuring costs		0		0
AmeriGas operations enhancement for growth project		(6)		(13)
Costs associated with exit of the UGI International energy marketing business		0		0
Impairment of assets		0		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
Costs associated with exit of the UGI International energy marketing business				0
AmeriGas Propane \| Cost of sales
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions	3	34	10	28
AmeriGas Propane \| Other operating expense (income), net
Segment Reporting Information [Line Items]
Net gains (losses) on commodity derivative instruments not associated with current-period transactions		$ 0	0	0
Interest income from intersegment loan	0		0
AmeriGas Propane \| Operating and administrative expenses/Other operating expense (income), net
Segment Reporting Information [Line Items]
Costs associated with exit of the UGI International energy marketing business				$ 0
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