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Dispositions (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposals of businesses |  | $ (36) | $ (95) | $ (221)
Pending sale | UniverGas |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposals of businesses |  | (50) |  |
Held-for-Sale, Not Discontinued Operations | UGI International |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposals of businesses |  | (3) |  |
Held-for-Sale, Not Discontinued Operations | UGID |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Pre-tax impairment charges |  | 3 | 62 |
Sale | AmeriGas OLP, Hawaii |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposals of businesses |  | 17 |  |
Consideration paid |  | $ 220 |  |
Sale | UGID |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposals of businesses |  |  | (66) |
Consideration paid |  |  | 43 |
Sale | France Energy Marketing Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Pre-tax gain (loss) |  |  | (29) |
Sale | Netherlands |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Reduction in revenue |  |  | $ 42 |
Pre-tax impairment charges |  |  |  | 19
Sale | European energy marketing business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Total settlement consideration | $ 5 |  |  |
Settlement gain (loss) | $ (5) |  |  |
Sale | Belgium Energy Marketing Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Pre-tax gain (loss) |  |  |  | (6)
Sale | U.K. Energy Marketing Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Pre-tax gain (loss) |  |  |  | $ (215)

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