Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Total long-term debt	$ 6,678		$ 6,600
Less: current maturities	(235)		(57)
Total long-term debt due after one year	6,443		6,543
UGI Utilities, Inc.
Debt Instrument [Line Items]
Unamortized debt issuance costs	(7)		(6)
Total long-term debt	1,889		1,649
Midstream & Marketing
Debt Instrument [Line Items]
Unamortized debt issuance costs	(13)		(15)
Total long-term debt	814		820
UGI International
Debt Instrument [Line Items]
Unamortized debt issuance costs	(6)		(8)
Total long-term debt	787		739
AmeriGas Propane
Debt Instrument [Line Items]
Unamortized debt issuance costs	(10)		(15)
Total long-term debt	1,877		2,385
UGI Corporation
Debt Instrument [Line Items]
Unamortized debt issuance costs	(19)		(3)
Total long-term debt	1,311		1,007
UGI Corporation | Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 115		283
4.12% due September 2046 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.12%
Long-term debt, gross	$ 200		200
4.98% due March 2044 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.98%
Long-term debt, gross	$ 175		175
3.12% due April 2050 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	3.12%
Long-term debt, gross	$ 150		150
4.55% due February 2049 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.55%
Long-term debt, gross	$ 150		150
4.12% due October 2046 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.12%
Long-term debt, gross	$ 100		100
6.21% due September 2036 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	6.21%
Long-term debt, gross	$ 100		100
2.95% due June 2026 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	2.95%
Long-term debt, gross	$ 100		100
1.59% due June 2026 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	1.59%
Long-term debt, gross	$ 100		100
1.64% due September 2026 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	1.64%
Long-term debt, gross	$ 75		75
4.75% due July 2032 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.75%
Long-term debt, gross	$ 90		90
4.99% due September 2052 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	4.99%
Long-term debt, gross	$ 85		85
6.02% due November 2030 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	6.02%
Long-term debt, gross	$ 25		0
6.10% due November 2033 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	6.10%
Long-term debt, gross	$ 150		0
6.40% due November 2053 | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	6.40%
Long-term debt, gross	$ 75		0
6.13% due October 2034 | UGI Utilities, Inc. | Medium-Term Note
Debt Instrument [Line Items]
Interest rate (as a percentage)	6.13%
Long-term debt, gross	$ 20		20
6.50% due August 2033 | UGI Utilities, Inc. | Medium-Term Note
Debt Instrument [Line Items]
Interest rate (as a percentage)	6.50%
Long-term debt, gross	$ 20		20
Mountaineer senior notes | UGI Utilities, Inc. | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	196		199
Variable-rate term loan | UGI Utilities, Inc. | Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	83		89
Variable-rate term loan | Midstream & Marketing | Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	786		794
Variable-rate term loan | UGI International | Term Loan Due March 2028
Debt Instrument [Line Items]
Long-term debt, gross	335		317
Other | UGI Utilities, Inc. | Other
Debt Instrument [Line Items]
Long-term debt, gross	2		2
Other | Midstream & Marketing | Other
Debt Instrument [Line Items]
Long-term debt, gross	41		41
Other | UGI International | Other
Debt Instrument [Line Items]
Long-term debt, gross	$ 12		6
2.50% Senior Notes due December 2029 | UGI International | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	2.50%
Long-term debt, gross	$ 446		424
5.50% due May 2025 | AmeriGas Propane | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	5.50%
Long-term debt, gross	$ 218		700
5.875% due August 2026 | AmeriGas Propane | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	5.875%
Long-term debt, gross	$ 664		675
5.75% due May 2027 | AmeriGas Propane | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	5.75%
Long-term debt, gross	$ 512		525
9.375% due May 2028 | AmeriGas Propane | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	9.375%
Long-term debt, gross	$ 493		500
3-year Term loan | UGI Corporation | Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	300		300
5-year Term Loan | UGI Corporation | Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	0		212
7-Year Term Loan | UGI Corporation | Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	215		215
UGI Corporation Senior Notes | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)		5.00%
UGI Corporation Senior Notes | UGI Corporation | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 700		$ 0