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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 |  |  |  |  |  |  |  |  |  |  |

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