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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, impairment loss |  | $ 230 |  | $ 230 |  |
Goodwill | $ 17,676 |  |  | 17,676 |  | $ 17,936
Amortization of intangible assets | 119 |  | $ 111 | 366 | $ 319 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Air Distribution Technologies |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill, impairment loss | 21 |  |  |  |  |
Reporting Unit With Current Year Impairment |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 212 |  |  | $ 212 |  |

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