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Debt - Schedule of Credit Facilities and Short-term Borrowings (Details) | Sep. 30, 2023 USD ($) | Sep. 30, 2023 EUR (€) | Sep. 30, 2022 USD ($) | Sep. 30, 2022 EUR (€)
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AmeriGas OLP |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Total Capacity | $ 600,000,000 |  | $ 600,000,000 |
Borrowings Outstanding | 0 |  | 131,000,000 |
Letters of Credit and Guarantees Outstanding | 2,000,000 |  | 2,000,000 |
Available Borrowing Capacity | $ 598,000,000 |  | $ 467,000,000 |
Weighted Average Interest Rate - End of Year |  |  | 7.27% | 7.27%
UGI International LLC |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Total Capacity | € |  | € 500,000,000 |  | € 300,000,000
Borrowings Outstanding | € |  | 202,000,000 |  | 0
Letters of Credit and Guarantees Outstanding | € |  | 0 |  | 0
Available Borrowing Capacity | € |  | € 298,000,000 |  | € 300,000,000
Weighted Average Interest Rate - End of Year | 5.17% | 5.17% |  |
Energy Services |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Total Capacity | $ 260,000,000 |  | $ 260,000,000 |
Borrowings Outstanding | 57,000,000 |  | 0 |
Letters of Credit and Guarantees Outstanding | 0 |  | 0 |
Available Borrowing Capacity | $ 203,000,000 |  | 260,000,000 |
Weighted Average Interest Rate - End of Year | 7.67% | 7.67% |  |
UGI Utilities |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Total Capacity | $ 425,000,000 |  | 350,000,000 |
Borrowings Outstanding | 248,000,000 |  | 151,000,000 |
Letters of Credit and Guarantees Outstanding | 0 |  | 0 |
Available Borrowing Capacity | $ 177,000,000 |  | $ 199,000,000 |
Weighted Average Interest Rate - End of Year | 6.30% | 6.30% | 4.37% | 4.37%
Mountaineer |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Total Capacity | $ 150,000,000 |  | $ 100,000,000 |
Borrowings Outstanding | 84,000,000 |  | 85,000,000 |
Letters of Credit and Guarantees Outstanding | 0 |  | 0 |
Available Borrowing Capacity | $ 66,000,000 |  | $ 15,000,000 |
Weighted Average Interest Rate - End of Year | 6.68% | 6.68% | 3.82% | 3.82%
UGI Corporation |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Total Capacity | $ 300,000,000 |  | $ 300,000,000 |
Borrowings Outstanding | 283,000,000 |  | 252,000,000 |
Letters of Credit and Guarantees Outstanding | 0 |  | 0 |
Available Borrowing Capacity | $ 17,000,000 |  | $ 48,000,000 |
Weighted Average Interest Rate - End of Year | 7.80% | 7.80% | 5.62% | 5.62%

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