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Dispositions and Acquisitions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Jan. 31, 2022 | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on disposal of UGID |  |  |  |  |  |  | $ (95) | $ (221) | $ 0 |  |
Pennant |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 53.00% |  |  | 53.00% |  |
Total purchase price |  |  |  |  |  | $ 61 |  |  |  |  |
Other-than-temporary pre-tax impairment charge |  |  |  |  |  | $ 44 |  |  |  |  |
Effective ownership interest in AmeriGas OLP (as a percentage) |  |  |  |  |  | 47.00% |  |  | 47.00% |  |
Stonehenge | Energy Services |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | $ 190 |  |  |  |  |  |  |  |  |
Sale | UGID |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  | 43 |  |  |  |
Pre-tax impairment charges |  |  | $ 62 |  |  |  |  |  |  |  |
Loss on disposal of UGID |  |  |  |  |  |  | 66 |  |  |  |
Sale | France Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  |  |  |  |  |  |  |  |  | $ 29 |
Pre-tax loss |  |  |  |  |  |  | $ 29 |  |  |  |
Sale | Belgium Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  |  |  |  |  |  |  | 3 |  |  |
Pre-tax loss |  |  |  |  |  |  |  | 6 |  |  |
Sale | U.K. Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  |  |  |  |  |  |  |  |  |  | $ 19
Pre-tax loss |  |  |  |  |  |  |  | $ 215 |  |  |
Net carrying value |  |  |  |  |  |  |  |  |  |  | $ 206
Sale | Netherlands |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment charges |  |  |  |  | $ 19 |  |  |  |  |  |
Settlement gain (loss) |  |  |  | $ 46 |  |  |  |  |  |  |
Reduction in revenue |  |  |  | $ 42 |  |  |  |  |  |  |
Sale | European energy marketing business |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement gain (loss) | $ (5) |  |  |  |  |  |  |  |  |  |
Total settlement consideration | $ 5 |  |  |  |  |  |  |  |  |  |

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