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Debt - Schedule of Credit Facilities and Short-term Borrowings (Details) | Oct. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Nov. 30, 2023 USD ($) | Nov. 09, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 EUR (€)
--- | --- | --- | --- | --- | --- | --- | ---
AmeriGas OLP |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200,000,000 |  |  |  | $ 600,000,000 |
Borrowings Outstanding |  | 51,000,000 |  |  |  | 0 |
Letters of Credit and Guarantees Outstanding |  | 0 |  |  |  | 2,000,000 |
Available Borrowing Capacity |  | $ 149,000,000 |  |  |  | 598,000,000 |
Weighted Average Interest Rate - End of Year |  | 7.29% | 7.29% |  |  |  |
AmeriGas OLP | Letter of Credit | AmeriGas OLP Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 20,000,000 |  |  |  | $ 100,000,000 |
AmeriGas OLP | Subsequent Event |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 300,000,000 |  |  |  |  |  |
UGI International LLC |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | € |  |  | € 500,000,000 |  |  |  | € 500,000,000
Borrowings Outstanding | € |  |  | 115,000,000 |  |  |  | 202,000,000
Letters of Credit and Guarantees Outstanding | € |  |  | 0 |  |  |  | 0
Available Borrowing Capacity | € |  |  | € 385,000,000 |  |  |  | € 298,000,000
Weighted Average Interest Rate - End of Year |  | 4.88% | 4.88% |  |  | 5.17% | 5.17%
Energy Services |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 300,000,000 |  |  |  | $ 260,000,000 |
Borrowings Outstanding |  | 0 |  |  |  | 57,000,000 |
Letters of Credit and Guarantees Outstanding |  | 0 |  |  |  | 0 |
Available Borrowing Capacity |  | 300,000,000 |  |  |  | $ 203,000,000 |
Weighted Average Interest Rate - End of Year |  |  |  |  |  | 7.67% | 7.67%
Energy Services | Letter of Credit | Energy Services Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 50,000,000 |  |  |  |  |
UGI Utilities |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 375,000,000 |  |  |  | $ 425,000,000 |
Borrowings Outstanding |  | 190,000,000 |  |  |  | 248,000,000 |
Letters of Credit and Guarantees Outstanding |  | 0 |  |  |  | 0 |
Available Borrowing Capacity |  | $ 185,000,000 |  |  |  | $ 177,000,000 |
Weighted Average Interest Rate - End of Year |  | 5.92% | 5.92% |  |  | 6.30% | 6.30%
UGI Utilities | Letter of Credit | UGI Utilities, Inc. Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 50,000,000 |  |  |  |  |
Mountaineer |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 150,000,000 |  |  |  | $ 150,000,000 |
Borrowings Outstanding |  | 96,000,000 |  |  |  | 84,000,000 |
Letters of Credit and Guarantees Outstanding |  | 0 |  |  |  | 0 |
Available Borrowing Capacity |  | $ 54,000,000 |  |  |  | $ 66,000,000 |
Weighted Average Interest Rate - End of Year |  | 6.56% | 6.56% |  |  | 6.68% | 6.68%
Mountaineer | Letter of Credit | Line of Credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 20,000,000 |  |  |  |  |
UGI Corporation |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 300,000,000 |  |  |  | $ 300,000,000 |
Borrowings Outstanding |  | 115,000,000 |  |  |  | 283,000,000 |
Letters of Credit and Guarantees Outstanding |  | 0 |  |  |  | 0 |
Available Borrowing Capacity |  | $ 185,000,000 |  |  |  | $ 17,000,000 |
Weighted Average Interest Rate - End of Year |  | 7.45% | 7.45% |  |  | 7.80% | 7.80%
UGI Utilities, Inc. | Letter of Credit | UGI Utilities Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 50,000,000 | $ 100,000,000 |  |

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