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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2023 | May 31, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Business Acquisitions |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  | $ 726 | $ 269 | $ 725
Goodwill |  |  | 17,936 | 17,350 | $ 18,335
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Business Acquisitions |  |  |  |  |
Reduction in fair value of contingent earn-out liability |  |  | 39 |  |
FM:Systems |  |  |  |  |
Business Acquisitions |  |  |  |  |
Business combination, consideration transferred | $ 540 |  |  |  |
Payments to acquire businesses, net of cash acquired | 465 |  |  |  |
Contingent earn-out liabilities | $ 75 |  |  |  |
Contingent earn-out period | 2 years |  |  |  |
Business combination, contingent consideration arrangements, range of outcomes, value, high | $ 155 |  |  |  |
Goodwill | $ 399 |  |  |  |
Silent-Aire |  |  |  |  |
Business Acquisitions |  |  |  |  |
Business combination, consideration transferred |  | $ 755 |  |  |
Payments to acquire businesses, net of cash acquired |  | 661 |  |  |
Business combination, contingent consideration arrangements, range of outcomes, value, high |  | 250 |  |  |
Business combination, working capital adjustment |  | 8 |  |  |
Contingent earn-out liabilities |  | $ 86 |  |  |
Silent-Aire | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Business Acquisitions |  |  |  |  |
Reduction in fair value of contingent earn-out liability |  |  | 30 | 43 |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisitions |  |  |  |  |
Business combination, consideration transferred |  |  | 306 | 323 |
Payments to acquire businesses, net of cash acquired |  |  | 260 | 269 |
Goodwill |  |  |  | 194 |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  |  | 116 | 123 |
Building Solutions EMEA/LA | Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisitions |  |  |  |  |
Goodwill |  |  | 13 | 68 |
Global Products | Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisitions |  |  |  |  |
Goodwill |  |  | 119 | 45 |
Building Solutions Asia Pacific | Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisitions |  |  |  |  |
Goodwill |  |  | $ 55 | 44 |
Building Solutions North America | Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisitions |  |  |  |  |
Goodwill |  |  |  | $ 36 |

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