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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Goodwill |  |  |  |  |
Balance at beginning of period |  |  | $ 3,612,000,000 | $ 3,770,000,000 |
Purchase accounting adjustments |  |  |  | (5,000,000) |
Foreign currency translation |  |  | 68,000,000 | (153,000,000) |
Impairment of goodwill |  |  | (656,000,000) | 0 | $ 0
Acquisitions |  |  | 3,000,000 |  |
Balance at end of period | $ 3,027,000,000 |  | 3,027,000,000 | 3,612,000,000 | 3,770,000,000
AmeriGas Propane |  |  |  |  |
Goodwill |  |  |  |  |
Balance at beginning of period |  |  | 2,004,000,000 | 2,004,000,000 |
Purchase accounting adjustments |  |  |  | 0 |
Foreign currency translation |  |  | 0 | 0 |
Impairment of goodwill | (656,000,000) | $ (656,000,000) | (656,000,000) |  |
Acquisitions |  |  | 0 |  |
Balance at end of period | 1,348,000,000 |  | 1,348,000,000 | 2,004,000,000 | 2,004,000,000
UGI International |  |  |  |  |
Goodwill |  |  |  |  |
Balance at beginning of period |  |  | 840,000,000 | 993,000,000 |
Purchase accounting adjustments |  |  |  | 0 |
Foreign currency translation |  |  | 68,000,000 | (153,000,000) |
Impairment of goodwill |  |  | 0 |  |
Acquisitions |  |  | 3,000,000 |  |
Balance at end of period | 911,000,000 |  | 911,000,000 | 840,000,000 | 993,000,000
Midstream & Marketing |  |  |  |  |
Goodwill |  |  |  |  |
Balance at beginning of period |  |  | 336,000,000 | 336,000,000 |
Purchase accounting adjustments |  |  |  | 0 |
Foreign currency translation |  |  | 0 | 0 |
Impairment of goodwill |  |  | 0 |  |
Acquisitions |  |  | 0 |  |
Balance at end of period | 336,000,000 |  | 336,000,000 | 336,000,000 | 336,000,000
Utilities |  |  |  |  |
Goodwill |  |  |  |  |
Balance at beginning of period |  |  | 432,000,000 | 437,000,000 |
Purchase accounting adjustments |  |  |  | (5,000,000) |
Foreign currency translation |  |  | 0 | 0 |
Impairment of goodwill |  |  | 0 |  |
Acquisitions |  |  | 0 |  |
Balance at end of period | $ 432,000,000 |  | $ 432,000,000 | $ 432,000,000 | $ 437,000,000

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