Debt - Schedule of Short-term Debt (Details)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)
Short-term Debt [Line Items]
Weighted Average Interest Rate - End of Year			6.25%	6.25%
AmeriGas OLP
Short-term Debt [Line Items]
Total Capacity	$ 600,000,000		$ 600,000,000
Borrowings Outstanding	186,000,000		328,000,000
Letters of Credit and Guarantees Outstanding	$ 62,000,000		$ 63,000,000
Available Borrowing Capacity | €		€ 352,000,000		€ 209,000,000
Weighted Average Interest Rate - End of Year	2.61%	2.61%	4.50%	4.50%
UGI International LLC
Short-term Debt [Line Items]
Total Capacity | €		€ 300,000,000		€ 300,000,000
Borrowings Outstanding		0	$ 210,000,000	193,000,000
Letters of Credit and Guarantees Outstanding | €		0		0
Available Borrowing Capacity | €		300,000,000		€ 107,000,000
Weighted Average Interest Rate - End of Year			3.64%	3.64%
Energy Services
Short-term Debt [Line Items]
Total Capacity	$ 260,000,000		$ 200,000,000
Borrowings Outstanding	0		45,000,000
Letters of Credit and Guarantees Outstanding	0		0
Available Borrowing Capacity | €		260,000,000		€ 155,000,000
UGI Utilities
Short-term Debt [Line Items]
Total Capacity	350,000,000		350,000,000
Borrowings Outstanding	141,000,000		166,000,000
Letters of Credit and Guarantees Outstanding	$ 0		$ 0
Available Borrowing Capacity | €		€ 209,000,000		€ 184,000,000
Weighted Average Interest Rate - End of Year	1.12%	1.12%	3.00%	3.00%
UGI Corporation
Short-term Debt [Line Items]
Total Capacity	$ 300,000,000		$ 300,000,000
Borrowings Outstanding	300,000,000		300,000,000
Letters of Credit and Guarantees Outstanding	$ 0		$ 0
Available Borrowing Capacity | €		€ 0		€ 0
Weighted Average Interest Rate - End of Year	2.41%	2.41%	4.55%	4.55%