Debt - Narrative (Details)		1 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2024 USD ($)	Aug. 31, 2024 USD ($)	Jun. 30, 2024 USD ($) $ / shares	Oct. 17, 2025 USD ($)	Apr. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Nov. 30, 2024 USD ($)	Nov. 22, 2024 USD ($)	Oct. 31, 2024 USD ($)	May 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Nov. 30, 2023 USD ($)	Nov. 09, 2023 USD ($)
Debt Instrument [Line Items]
Net proceeds						$ 1,321,000,000	$ 1,930,000,000	$ 1,257,000,000
Cash contribution to the partnership			$ 315,000,000
Restricted net assets						3,500,000,000
Energy Services
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 300,000,000	$ 260,000,000
Senior Notes Due 2030 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount														$ 25,000,000
Interest rate (as a percentage)														6.02%
Conversion price (in dollars per share) | $ / shares						$ 27.60
Default conversion settlement ratio						1
Conversion ratio						0.0362319
Senior Notes Due 2033 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount														$ 150,000,000
Interest rate (as a percentage)														6.10%
Senior Notes Due 2053 | Senior Notes | UGI Utilities, Inc.
Debt Instrument [Line Items]
Principal amount														$ 75,000,000
Interest rate (as a percentage)														6.40%
UGI Utilities Credit Agreement | Line of Credit | UGI Utilities, Inc. | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity														$ 375,000,000
Increase to limit														125,000,000
UGI Utilities Credit Agreement | Line of Credit | UGI Utilities, Inc. | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity														50,000,000	$ 100,000,000
UGI Utilities Credit Agreement | Line of Credit | UGI Utilities, Inc. | Bridge Loan
Debt Instrument [Line Items]
Maximum borrowing capacity														$ 38,000,000
UGI Energy Services Amended Term Loan Credit Agreement | Line of Credit | Revolver | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate			2.50%
UGI Energy Services Amended Term Loan Credit Agreement | Line of Credit | Revolver | SOFR base rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
UGI Energy Services Credit Agreement | Line of Credit | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity												$ 300,000,000
UGI Energy Services Credit Agreement | Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity												$ 50,000,000
UGI International Amended and Restated Credit Agreement | Line of Credit | Revolver
Debt Instrument [Line Items]
Key performance indicators adjustment percentage			0.05%
AmeriGas Senior Secured Revolving Credit Facility | Line of Credit | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 200,000,000
Debt term		5 years
AmeriGas Senior Secured Revolving Credit Facility | Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 20,000,000
AmeriGas Partners Senior Notes | Senior Notes | AmeriGas Partners and AmeriGas Finance Corp.
Debt Instrument [Line Items]
Principal amount						$ 218,000,000
Interest rate (as a percentage)			5.50%
Repurchased aggregate principal amount			$ 475,000,000
Repayment of debt			$ 315,000,000
Repurchased aggregate principal amount													$ 38,000,000
5.50 Percent Senior Notes | Senior Notes | AmeriGas Partners and AmeriGas Finance Corp.
Debt Instrument [Line Items]
Interest rate (as a percentage)			5.50%										5.50%
Repurchased aggregate principal amount													$ 7,000,000
5.875 Percent Senior Notes | Senior Notes | AmeriGas Partners and AmeriGas Finance Corp.
Debt Instrument [Line Items]
Interest rate (as a percentage)													5.875%
Repurchased aggregate principal amount													$ 11,000,000
5.75 Percent Senior Notes | Senior Notes | AmeriGas Partners and AmeriGas Finance Corp.
Debt Instrument [Line Items]
Interest rate (as a percentage)													5.75%
Repurchased aggregate principal amount													$ 13,000,000
9.375 Percent Senior Notes | Senior Notes | AmeriGas Partners and AmeriGas Finance Corp.
Debt Instrument [Line Items]
Interest rate (as a percentage)													9.375%
Repurchased aggregate principal amount													$ 7,000,000
UGI Corporation Credit Facility Agreement, Variable-Rate Term Loan 1 | Line of Credit
Debt Instrument [Line Items]
Principal amount	$ 215,000,000
Applicable rate increase	0.375%
UGI Corporation Credit Facility Agreement, Variable-Rate Term Loan 2 | Line of Credit
Debt Instrument [Line Items]
Principal amount	$ 300,000,000
Applicable rate increase	0.375%
UGI Corporation Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 700,000,000
Interest rate (as a percentage)			5.00%
Net proceeds			$ 682,000,000
UGI Corporation Senior Notes | Senior Notes | Level 2
Debt Instrument [Line Items]
Estimated fair value						744,000,000
UGI Corporation Senior Notes | Senior Notes | Debt Instrument, Redemption, 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 | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Market price conversion trigger (as a percentage)			98.00%
Senior Notes Due 2029 | Senior Notes | UGI Utilities, Inc. | Subsequent Event
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. | Subsequent Event
Debt Instrument [Line Items]
Principal amount									$ 125,000,000
Interest rate (as a percentage)									5.52%
UGI Corporation Credit Facility Agreement | Line of Credit
Debt Instrument [Line Items]
Borrowings outstanding						$ 630,000,000
UGI Corporation Credit Facility Agreement | Line of Credit | Revolver | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 475,000,000	$ 475,000,000
UGI Corporation Credit Facility Agreement | Line of Credit | Letter of Credit | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity										10,000,000	10,000,000
UGI Corporation Credit Facility Agreement | Line of Credit | Senior Secured Notes | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 400,000,000	$ 400,000,000
Energy Services Receivables Facility | Energy Services | Subsequent Event | Receivables Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 75,000,000	$ 150,000,000
Option to increase				$ 50,000,000