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v3.23.3

Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Goodwill [Line Items] |  |  |  |  |
Impairment of goodwill |  |  | $ 656,000,000 | $ 0 | $ 0
Goodwill | $ 3,027,000,000 |  | 3,027,000,000 | 3,612,000,000 | 3,770,000,000
Accumulated impairment losses | 656,000,000 |  | 656,000,000 | 0 |
AmeriGas Propane |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of goodwill | 656,000,000 | $ 656,000,000 | 656,000,000 |  |
Goodwill | 1,348,000,000 |  | 1,348,000,000 | $ 2,004,000,000 | $ 2,004,000,000
Accumulated impairment losses | $ 656,000,000 |  | $ 656,000,000 |  |
UGI International |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Fair value in excess of carrying value | 10.00% |  | 10.00% |  |
Goodwill | $ 911,000,000 |  | $ 911,000,000 |  |

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