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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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