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Equity Method Investments (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 370 | $ 393 | $ 340
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | 1 | 1 | 0
Midstream & Marketing |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | 359 | 382 | 305
Midstream & Marketing | Aurum Renewables |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 47 | $ 47 | $ 46
Ownership Interest | 40.00% | 40.00% | 40.00%
Midstream & Marketing | Pine Run |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 86 | $ 91 | $ 81
Ownership Interest | 49.00% | 49.00% | 49.00%
Midstream & Marketing | MBL Bioenergy |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 206 | $ 221 | $ 157
Ownership Interest | 99.99% | 99.99% | 99.99%
Midstream & Marketing | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 20 | $ 23 | $ 21
UGI International |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | 10 | $ 10 | $ 35
UGI International | Joint Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Loss on extinguishments of debt | $ 26 |  |

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