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Debt - Narrative (Details)		1 Months Ended				2 Months Ended	6 Months Ended		12 Months Ended
	Jul. 31, 2025 USD ($)	Aug. 31, 2025 USD ($)	May 31, 2025 USD ($)	Feb. 28, 2025 USD ($)	Jun. 30, 2024 USD ($) $ / shares	Nov. 21, 2025 USD ($)	Oct. 17, 2026 USD ($)	Apr. 30, 2026 USD ($)	Sep. 30, 2025 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Apr. 30, 2025 USD ($)	Nov. 30, 2024 USD ($)	Oct. 31, 2024 USD ($)
Debt Instrument [Line Items]
Loss on extinguishments of debt									$ (10,000,000)	$ (9,000,000)	$ (9,000,000)
Restricted net assets									3,400,000,000
AmeriGas Partners
Debt Instrument [Line Items]
Funding				$ 221,000,000
Notes Payable									200,000,000
AmeriGas Partners | Subsequent Event
Debt Instrument [Line Items]
Repayments of Notes Payable						$ 35,000,000
Mountaineer
Debt Instrument [Line Items]
Maximum borrowing capacity									150,000,000	150,000,000
Energy Services
Debt Instrument [Line Items]
Maximum borrowing capacity									300,000,000	300,000,000
Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount									175,000,000
Line of Credit | Mountaineer | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 20,000,000
Senior Notes Due 2030 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount	$ 150,000,000
Interest rate (as a percentage)	5.10%
Default conversion settlement ratio									1
Conversion ratio									0.0362319
Senior Notes Due 2030 | Senior Notes | UGI Utilities, Inc. | Subsequent Event
Debt Instrument [Line Items]
Principal amount						$ 150,000,000
Interest rate (as a percentage)						5.10%
Senior Notes Due 2030 | Senior Notes | AmeriGas Partners And AmeriGas Finance Corp.
Debt Instrument [Line Items]
Principal amount			$ 550,000,000
Interest rate (as a percentage)			9.50%
Senior Notes Due 2035 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount	$ 125,000,000
Interest rate (as a percentage)	5.68%
Senior Notes Due 2035 | Senior Notes | UGI Utilities, Inc. | Subsequent Event
Debt Instrument [Line Items]
Principal amount						$ 125,000,000
Interest rate (as a percentage)						5.68%
2.95% due June 2026 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Interest rate (as a percentage)									2.95%
1.59% due June 2026 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Interest rate (as a percentage)									1.59%
1.64% due September 2026 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Interest rate (as a percentage)									1.64%
Senior Notes Due 2029 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount													$ 50,000,000
Interest rate (as a percentage)													5.24%
Senior Notes Due 2034 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount													$ 125,000,000
Interest rate (as a percentage)													5.52%
Mountaineer 2025 Credit Agreement | Line of Credit | Mountaineer | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 150,000,000
Increase to limit			250,000,000
Mountaineer 2025 Credit Agreement | Line of Credit | Mountaineer | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 20,000,000
Senior Notes Due June 1, 2035 | Senior Notes | Mountaineer
Debt Instrument [Line Items]
Principal amount												$ 50,000,000
Interest rate (as a percentage)												6.11%
Senior Notes Due June 1, 2037 | Senior Notes | Mountaineer
Debt Instrument [Line Items]
Principal amount												$ 20,000,000
Interest rate (as a percentage)												6.21%
AmeriGas Partners Senior Notes | Senior Notes | AmeriGas Partners
Debt Instrument [Line Items]
Interest rate (as a percentage)			5.875%
Redemption			$ 664,000,000
Loss on extinguishments of debt									$ 9,000,000
UGI Corporation Credit Facility Agreement | Line of Credit | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 300,000,000												$ 475,000,000
Borrowings				$ 221,000,000
Debt term		1 year
UGI Corporation Credit Facility Agreement | Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity														10,000,000
UGI Corporation Credit Facility Agreement | Line of Credit | Senior Secured Notes
Debt Instrument [Line Items]
Maximum borrowing capacity														400,000,000
5.50 Percent Senior Notes | Senior Notes | AmeriGas Partners
Debt Instrument [Line Items]
Interest rate (as a percentage)									5.50%
Redeemed									$ 218,000,000
AmeriGas Senior Secured Revolving Credit Facility | Line of Credit | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity										200,000,000				$ 300,000,000
UGI Corporation Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount					$ 700,000,000
Interest rate (as a percentage)					5.00%
Conversion price (in dollars per share) | $ / shares									$ 27.60
Interest expense									$ 40,000,000
Effective interest rate (as a percentage)									5.69%
UGI Corporation Senior Notes | Senior Notes | Level 2
Debt Instrument [Line Items]
Estimated fair value									$ 894,000,000	$ 744,000,000
UGI Corporation Senior Notes | Senior Notes | Period One
Debt Instrument [Line Items]
Market price conversion trigger (as a percentage)					130.00%
Conversion price (in dollars per share) | $ / shares					$ 27.60
UGI Corporation Senior Notes | Senior Notes | Period Two
Debt Instrument [Line Items]
Market price conversion trigger (as a percentage)					98.00%
Energy Services Receivables Facility | Energy Services | Receivables Facility | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 75,000,000	$ 150,000,000
Option to increase							$ 50,000,000
Senior Notes Due June 2026 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Interest rate (as a percentage)	1.59%
Repayments of Secured Debt	$ 100,000,000
Senior Notes Due September 2026 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Interest rate (as a percentage)	1.64%
Repayments of Secured Debt	$ 75,000,000

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