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Debt - Schedule of Principal Repayments of Long-term Debt (Details) - USD ($)	Nov. 22, 2024	Oct. 31, 2024	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
2025			$ 235,000,000
2026			955,000,000
2027			586,000,000
2028			1,577,000,000
2029			10,000,000
Revolver \| UGI Corporation Credit Facility Agreement \| Line of Credit \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 475,000,000	$ 475,000,000
Letter of Credit \| UGI Corporation Credit Facility Agreement \| Line of Credit \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	10,000,000	10,000,000
Senior Secured Notes \| UGI Corporation Credit Facility Agreement \| Line of Credit \| Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000	$ 400,000,000
Utilities
Debt Instrument [Line Items]
2025			7,000,000
2026			281,000,000
2027			64,000,000
2028			40,000,000
2029			0
Midstream & Marketing
Debt Instrument [Line Items]
2025			8,000,000
2026			8,000,000
2027			8,000,000
2028			8,000,000
2029			8,000,000
UGI International
Debt Instrument [Line Items]
2025			2,000,000
2026			2,000,000
2027			2,000,000
2028			336,000,000
2029			2,000,000
AmeriGas Propane
Debt Instrument [Line Items]
2025			218,000,000
2026			664,000,000
2027			512,000,000
2028			493,000,000
2029			0
UGI Corporation
Debt Instrument [Line Items]
2025			0
2026			0
2027			0
2028			700,000,000
2029			0
Maximum borrowing capacity			$ 300,000,000	$ 300,000,000