Debt - Schedule of Credit Facilities and Short-term Borrowings (Details)	Oct. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 EUR (€)	Nov. 30, 2023 USD ($)	Nov. 09, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 EUR (€)
AmeriGas OLP
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 200,000,000				$ 600,000,000
Borrowings Outstanding		51,000,000				0
Letters of Credit and Guarantees Outstanding		0				2,000,000
Available Borrowing Capacity		$ 149,000,000				598,000,000
Weighted Average Interest Rate - End of Year		7.29%	7.29%
AmeriGas OLP | Letter of Credit | AmeriGas OLP Credit Agreement | Line of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 20,000,000				$ 100,000,000
AmeriGas OLP | Subsequent Event
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 300,000,000
UGI International LLC
Short-term Debt [Line Items]
Maximum borrowing capacity | €			€ 500,000,000				€ 500,000,000
Borrowings Outstanding | €			115,000,000				202,000,000
Letters of Credit and Guarantees Outstanding | €			0				0
Available Borrowing Capacity | €			€ 385,000,000				€ 298,000,000
Weighted Average Interest Rate - End of Year		4.88%	4.88%			5.17%	5.17%
Energy Services
Short-term Debt [Line Items]
Maximum borrowing capacity		$ 300,000,000				$ 260,000,000
Borrowings Outstanding		0				57,000,000
Letters of Credit and Guarantees Outstanding		0				0
Available Borrowing Capacity		300,000,000				$ 203,000,000
Weighted Average Interest Rate - End of Year						7.67%	7.67%
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				$ 425,000,000
Borrowings Outstanding		190,000,000				248,000,000
Letters of Credit and Guarantees Outstanding		0				0
Available Borrowing Capacity		$ 185,000,000				$ 177,000,000
Weighted Average Interest Rate - End of Year		5.92%	5.92%			6.30%	6.30%
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		96,000,000				84,000,000
Letters of Credit and Guarantees Outstanding		0				0
Available Borrowing Capacity		$ 54,000,000				$ 66,000,000
Weighted Average Interest Rate - End of Year		6.56%	6.56%			6.68%	6.68%
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		300,000,000				$ 300,000,000
Borrowings Outstanding		115,000,000				283,000,000
Letters of Credit and Guarantees Outstanding		0				0
Available Borrowing Capacity		$ 185,000,000				$ 17,000,000
Weighted Average Interest Rate - End of Year		7.45%	7.45%			7.80%	7.80%
UGI Utilities, Inc. | Letter of Credit | UGI Utilities Credit Agreement | Line of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity				$ 50,000,000	$ 100,000,000