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Debt - Schedule of Credit Facilities and Short-term Borrowings (Details)	12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 EUR (€)
Letter of Credit | Line of Credit
Short-term Debt [Line Items]
Borrowings	$ 1,600,000,000
Repayments	1,596,000,000
AmeriGas OLP
Short-term Debt [Line Items]
Maximum borrowing capacity	128,000,000		$ 200,000,000
Borrowings Outstanding	0		51,000,000
Letters of Credit and Guarantees Outstanding	2,000,000		0
Available Borrowing Capacity	$ 126,000,000		$ 149,000,000
Weighted Average Interest Rate - End of Year			7.29%	7.29%
UGI International LLC
Short-term Debt [Line Items]
Maximum borrowing capacity | €		€ 500,000,000		€ 500,000,000
Borrowings Outstanding | €		170,000,000		115,000,000
Letters of Credit and Guarantees Outstanding | €		0		€ 0
Available Borrowing Capacity		€ 330,000,000	$ 385,000,000
Weighted Average Interest Rate - End of Year	6.00%	6.00%	4.88%	4.88%
Energy Services
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 300,000,000		$ 300,000,000
Borrowings Outstanding	0		0
Letters of Credit and Guarantees Outstanding	0		0
Available Borrowing Capacity	300,000,000		300,000,000
Energy Services | Letter of Credit | Energy Services Credit Agreement | Line of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	50,000,000
UGI Utilities
Short-term Debt [Line Items]
Maximum borrowing capacity	375,000,000		375,000,000
Borrowings Outstanding	200,000,000		190,000,000
Letters of Credit and Guarantees Outstanding	0		0
Available Borrowing Capacity	$ 175,000,000		$ 185,000,000
Weighted Average Interest Rate - End of Year	5.13%	5.13%	5.92%	5.92%
UGI Utilities | Letter of Credit | UGI Utilities, Inc. Credit Agreement | Line of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 50,000,000
Mountaineer
Short-term Debt [Line Items]
Maximum borrowing capacity	150,000,000		$ 150,000,000
Borrowings Outstanding	69,000,000		96,000,000
Letters of Credit and Guarantees Outstanding	0		0
Available Borrowing Capacity	$ 81,000,000		$ 54,000,000
Weighted Average Interest Rate - End of Year	5.53%	5.53%	6.56%	6.56%
Mountaineer | Letter of Credit | Line of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 20,000,000
UGI Corporation
Short-term Debt [Line Items]
Maximum borrowing capacity	475,000,000		$ 300,000,000
Borrowings Outstanding	263,000,000		115,000,000
Letters of Credit and Guarantees Outstanding	0		0
Available Borrowing Capacity	$ 212,000,000		$ 185,000,000
Weighted Average Interest Rate - End of Year	6.63%	6.63%	7.45%	7.45%

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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