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Utility Regulatory Assets and Liabilities and Regulatory Matters - Schedule of Regulatory Assets and Liabilities Associated with Utilities (Details) - UGI Utilities, Inc. - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Regulatory Assets [Line Items]
Regulatory assets	$ 340	$ 319
Regulatory Liabilities [Line Items]
Regulatory liabilities	314	329
Postretirement benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities	14	13
Deferred fuel and power refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities	4	17
State income tax benefits — distribution system repairs
Regulatory Liabilities [Line Items]
Regulatory liabilities	49	44
Excess federal deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	239	247
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	8	8
Income taxes recoverable
Regulatory Assets [Line Items]
Regulatory assets	113	105
Underfunded pension plans
Regulatory Assets [Line Items]
Regulatory assets	100	106
Environmental costs
Regulatory Assets [Line Items]
Regulatory assets	22	28
Deferred fuel and power costs
Regulatory Assets [Line Items]
Regulatory assets	39	0
Removal costs, net
Regulatory Assets [Line Items]
Regulatory assets	30	28
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 36	$ 52

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