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Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 299 | $ 130 | $ 174
Aurum Renewables |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership Interest | 40.00% |  |
Midstream & Marketing |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 264 | 109 |
Midstream & Marketing | Aurum Renewables |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | 45 | 0 |
Midstream & Marketing | Pine Run |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 77 | $ 68 |
Ownership Interest | 49.00% | 49.00% |
Midstream & Marketing | MBL Bioenergy |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 122 | $ 23 |
Ownership Interest | 99.99% | 99.99% |
Midstream & Marketing | Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 20 | $ 18 |
UGI International |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Carrying Value | $ 35 | $ 21 |

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