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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 6,648 | $ 6,678 |
Less: current maturities | (117) | (235) |
Total long-term debt due after one year | 6,531 | 6,443 |
UGI Utilities, Inc. |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | (7) | (7) |
Total long-term debt | 2,124 | 1,889 |
Midstream & Marketing |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | (11) | (13) |
Total long-term debt | 807 | 814 |
UGI International |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | (5) | (6) |
Total long-term debt | 829 | 787 |
AmeriGas Propane |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | (14) | (10) |
Total long-term debt | 1,741 | 1,877 |
UGI Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | (16) | (19) |
Total long-term debt | 1,347 | 1,311 |
UGI Corporation | Eliminations |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ (200) | 0 |
4.12% due September 2046 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 4.12% |  |
Long-term debt, gross | $ 200 | 200 |
4.98% due March 2044 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 4.98% |  |
Long-term debt, gross | $ 175 | 175 |
3.12% due April 2050 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 3.12% |  |
Long-term debt, gross | $ 150 | 150 |
4.55% due February 2049 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 4.55% |  |
Long-term debt, gross | $ 150 | 150 |
4.12% due October 2046 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 4.12% |  |
Long-term debt, gross | $ 100 | 100 |
6.21% due September 2036 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 6.21% |  |
Long-term debt, gross | $ 100 | 100 |
2.95% due June 2026 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 2.95% |  |
Long-term debt, gross | $ 100 | 100 |
1.59% due June 2026 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 1.59% |  |
Long-term debt, gross | $ 100 | 100 |
1.64% due September 2026 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 1.64% |  |
Long-term debt, gross | $ 75 | 75 |
4.75% due July 2032 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 4.75% |  |
Long-term debt, gross | $ 90 | 90 |
4.99% due September 2052 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 4.99% |  |
Long-term debt, gross | $ 85 | 85 |
6.02% due November 2030 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 6.02% |  |
Long-term debt, gross | $ 25 | 25 |
6.10% due November 2033 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 6.10% |  |
Long-term debt, gross | $ 150 | 150 |
6.40% due November 2053 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 6.40% |  |
Long-term debt, gross | $ 75 | 75 |
5.24% due November 2029 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 5.24% |  |
Long-term debt, gross | $ 50 | 0 |
5.52% due November 2034 | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 5.52% |  |
Long-term debt, gross | $ 125 | 0 |
6.13% due October 2034 | UGI Utilities, Inc. | Medium-Term Note |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 6.13% |  |
Long-term debt, gross | $ 20 | 20 |
6.50% due August 2033 | UGI Utilities, Inc. | Medium-Term Note |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 6.50% |  |
Long-term debt, gross | $ 20 | 20 |
Mountaineer senior notes | UGI Utilities, Inc. | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 264 | 196 |
Variable-rate term loan | UGI Utilities, Inc. | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 76 | 83 |
Variable-rate term loan | Midstream & Marketing | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 778 | 786 |
Variable-rate term loan | UGI International | Term Loan Due March 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 352 | 335 |
Other | UGI Utilities, Inc. | Other |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 1 | 2 |
Other | Midstream & Marketing | Other |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 40 | 41 |
Other | UGI International | Other |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 13 | 12 |
Other | AmeriGas Propane |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 200 | 0 |
2.50% Senior Notes due December 2029 | UGI International | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 2.50% |  |
Long-term debt, gross | $ 469 | 446 |
5.50% due May 2025 | AmeriGas Propane | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 5.50% |  |
Long-term debt, gross | $ 0 | 218 |
5.875% due August 2026 | AmeriGas Propane | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 5.875% |  |
Long-term debt, gross | $ 0 | 664 |
5.75% due May 2027 | AmeriGas Propane | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 5.75% |  |
Long-term debt, gross | $ 512 | 512 |
9.375% due June 2028 | AmeriGas Propane | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 9.375% |  |
Long-term debt, gross | $ 493 | 493 |
9.50% due June 2030 | AmeriGas Propane | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) | 9.50% |  |
Long-term debt, gross | $ 550 | 0 |
Credit Facility Maturing August 2025 | UGI Corporation | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 0 | 115 |
Credit Facility Maturing October 2028 | UGI Corporation | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 263 | 0 |
3-year Term loan | UGI Corporation | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 0 | 300 |
5-year Term Loan | UGI Corporation | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 0 | 215 |
Due October | UGI Corporation | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | 400 | 0 |
UGI Corporation Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percentage) |  |  | 5.00%
UGI Corporation Senior Notes | UGI Corporation | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | $ 700 | $ 700 |

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