Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - UGI Utilities, Inc. - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Regulatory Assets [Line Items]
Regulatory assets	$ 319	$ 347
Regulatory Liabilities [Line Items]
Regulatory liabilities	329	366
Postretirement benefits
Regulatory Liabilities [Line Items]
Regulatory liabilities	13	12
Deferred fuel and power refunds
Regulatory Liabilities [Line Items]
Regulatory liabilities	17	55
State income tax benefits — distribution system repairs
Regulatory Liabilities [Line Items]
Regulatory liabilities	44	43
Excess federal deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory liabilities	247	254
Other
Regulatory Liabilities [Line Items]
Regulatory liabilities	8	2
Income taxes recoverable
Regulatory Assets [Line Items]
Regulatory assets	105	94
Underfunded pension plans
Regulatory Assets [Line Items]
Regulatory assets	106	111
Environmental costs
Regulatory Assets [Line Items]
Regulatory assets	28	28
Deferred fuel and power costs
Regulatory Assets [Line Items]
Regulatory assets	0	27
Removal costs, net
Regulatory Assets [Line Items]
Regulatory assets	28	23
Other
Regulatory Assets [Line Items]
Regulatory assets	$ 52	$ 64