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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Sep. 30, 2023 | Oct. 31, 2022 | Jan. 31, 2022 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Oct. 31, 2023 | Jul. 31, 2023 | Oct. 21, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments |  |  |  |  |  |  |  |  |  | $ (5) |  |  |  |
Investments in equity method investees |  |  |  |  |  |  |  |  | $ 146 | 47 | $ 65 |  |  |
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  | Costs associated with exit of the UGI International energy marketing business |  |  |  |  |  |
2021 UGI Corporation Senior Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 215 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale | U.K. Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19
Pre-tax loss |  |  | $ 215 |  |  |  |  |  |  |  |  |  |  |
After tax loss |  |  | $ 151 |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  |  |  |  |  |  | $ 276 |  |  | $ 276 |  |  |  | $ 206
Sale | France Energy Marketing Business | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |
Sale | Belgium Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  | $ 3 |  |  | $ 3 |  |  |  | 3 |  |  |  |  |
Pre-tax loss |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
After tax loss |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Sale | Netherland Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying value |  | $ 44 |  |  | 44 |  |  |  | $ 44 |  |  |  |  |
Reduction in revenue |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |
Held-for-Sale, Not Discontinued Operations | Netherland Energy Marketing Business |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 6 |
Pre-tax impairment charges |  |  |  |  |  | $ 19 |  |  |  |  |  |  |  |
Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | 540 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities incurred | $ 140 |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  | $ 13 |  |  |
Pennant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  | $ 61 |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 53.00% |  |  | 53.00% |  |  |  |
Pennant | Energy Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 53.00% |  |  | 53.00% |  |  |  |
Investments in equity method investees |  |  |  |  |  |  |  |  |  | $ 61 |  |  |  |
Stonehenge | Energy Services |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  | $ 190 |  |  |  |  |  |  |  |  |  |

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