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v3.25.3

Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | $ 17,920 | $ 17,737
Accumulated impairment loss |  |  | (1,195) | (965)
Beginning Balance |  | $ 16,725 | 16,772 |
Impairments | $ (230) |  | (230) |
Foreign currency translation and other |  | (92) | 183 |
Ending Balance |  | 16,633 | 16,725 | 16,772
Transfers |  | 86 |  |
Goodwill impairment loss | $ 230 |  | 230 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Air Distribution Technologies |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Impairments |  |  | (21) |
Goodwill impairment loss |  |  | 21 |
Americas |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 14,118 | 14,090
Accumulated impairment loss |  |  | (918) | (918)
Beginning Balance |  | 13,200 | 13,172 |
Impairments |  |  | 0 |
Foreign currency translation and other |  | (26) | 28 |
Ending Balance |  | 13,174 | 13,200 | 13,172
Goodwill impairment loss |  |  | 0 |
EMEA |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 2,409 | 2,302
Accumulated impairment loss |  |  | (277) | (47)
Beginning Balance |  | 2,132 | 2,255 |
Impairments |  |  | (230) |
Foreign currency translation and other |  | (21) | 107 |
Ending Balance |  | 2,111 | 2,132 | 2,255
Goodwill impairment loss |  |  | 230 |
APAC |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 1,393 | 1,345
Accumulated impairment loss |  |  | 0 | 0
Beginning Balance |  | 1,393 | 1,345 |
Impairments |  |  | 0 |
Foreign currency translation and other |  | (45) | 48 |
Ending Balance |  | $ 1,348 | 1,393 | $ 1,345
Goodwill impairment loss |  |  | $ 0 |

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