Debt - Schedule of Credit Facilities and Short-term Borrowings (Details)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Sep. 01, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)
AmeriGas OLP
Short-term Debt [Line Items]
Total Capacity	$ 600,000,000			$ 600,000,000
Borrowings Outstanding	170,000,000			186,000,000
Letters of Credit and Guarantees Outstanding	60,000,000			62,000,000
Available Borrowing Capacity	$ 370,000,000			$ 352,000,000
Weighted Average Interest Rate - End of Year	2.58%	2.58%		2.61%	2.61%
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, Inc.
Short-term Debt [Line Items]
Total Capacity	350,000,000			350,000,000
Borrowings Outstanding	130,000,000			141,000,000
Letters of Credit and Guarantees Outstanding	0			0
Available Borrowing Capacity	$ 220,000,000			$ 209,000,000
Weighted Average Interest Rate - End of Year	1.35%	1.35%		1.12%	1.12%
Mountaineer
Short-term Debt [Line Items]
Total Capacity	$ 100,000,000		$ 100,000,000
Borrowings Outstanding	67,000,000
Letters of Credit and Guarantees Outstanding	0
Available Borrowing Capacity	33,000,000
UGI Corporation
Short-term Debt [Line Items]
Total Capacity	300,000,000			$ 300,000,000
Borrowings Outstanding	185,000,000			300,000,000
Letters of Credit and Guarantees Outstanding	0			0
Available Borrowing Capacity	$ 115,000,000			$ 0
Weighted Average Interest Rate - End of Year				2.41%	2.41%