Debt - Schedule of Credit Facilities and Short-term Borrowings (Details)	2 Months Ended	12 Months Ended
	Nov. 21, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 EUR (€)	Sep. 30, 2021 EUR (€)
AmeriGas OLP
Short-term Debt [Line Items]
Total Capacity		$ 600,000,000	$ 600,000,000
Borrowings Outstanding		170,000,000	131,000,000
Letters of Credit and Guarantees Outstanding		60,000,000	2,000,000
Available Borrowing Capacity		$ 370,000,000	$ 467,000,000
Weighted Average Interest Rate - End of Year		2.58%	7.27%	7.27%	2.58%
UGI International LLC
Short-term Debt [Line Items]
Total 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
Short-term Debt [Line Items]
Total Capacity		$ 260,000,000	$ 260,000,000
Borrowings Outstanding		0	0
Letters of Credit and Guarantees Outstanding		0	0
Available Borrowing Capacity		260,000,000	260,000,000
UGI Utilities
Short-term Debt [Line Items]
Total Capacity		350,000,000	350,000,000
Borrowings Outstanding		130,000,000	151,000,000
Letters of Credit and Guarantees Outstanding		0	0
Available Borrowing Capacity		$ 220,000,000	$ 199,000,000
Weighted Average Interest Rate - End of Year		1.35%	4.37%	4.37%	1.35%
UGI Corporation
Short-term Debt [Line Items]
Total Capacity		$ 300,000,000	$ 300,000,000
Borrowings Outstanding		185,000,000	252,000,000
Letters of Credit and Guarantees Outstanding		0	0
Available Borrowing Capacity		$ 115,000,000	$ 48,000,000
Weighted Average Interest Rate - End of Year		3.27%			3.27%
Repayment of debt		$ 70,000,000
UGI Corporation | Subsequent Event
Short-term Debt [Line Items]
Repayment of debt	$ 87,000,000
UGI Corporation | Line of Credit
Short-term Debt [Line Items]
Weighted Average Interest Rate - End of Year			5.62%	5.62%
UGI Corporation | 2021 UGI Corporation Senior Credit Facility | Line of Credit
Short-term Debt [Line Items]
Repayment of debt		70,000,000
UGI Corporation | 2021 UGI Corporation Senior Credit Facility | Line of Credit | Letter of Credit
Short-term Debt [Line Items]
Total Capacity			$ 10,000,000
UGI Corporation | 2021 UGI Corporation Senior Credit Facility | Line of Credit | Subsequent Event
Short-term Debt [Line Items]
Repayment of debt	$ 87,000,000
Mountaineer
Short-term Debt [Line Items]
Total Capacity		100,000,000	100,000,000
Borrowings Outstanding		67,000,000	85,000,000
Letters of Credit and Guarantees Outstanding		0	0
Available Borrowing Capacity		$ 33,000,000	$ 15,000,000
Weighted Average Interest Rate - End of Year			3.82%	3.82%
Mountaineer | Line of Credit | Letter of Credit
Short-term Debt [Line Items]
Total Capacity			$ 20,000,000