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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisitions |  |  |  |
Payments to acquire businesses, net of cash acquired |  | $ 269 | $ 725 | $ 77
Goodwill |  | 17,328 | 18,335 | 17,932
Goodwill, acquired during period |  | 219 | 300 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |
Business Acquisitions |  |  |  |
Reduction in fair value of contingent earn-out liability |  | 43 |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisitions |  |  |  |
Business combination, consideration transferred |  | 323 |  |
Payments to acquire businesses, net of cash acquired |  | 269 |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles |  | 123 |  |
Goodwill |  | 194 |  |
Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Business combination, consideration transferred | $ 755 |  |  |
Payments to acquire businesses, net of cash acquired | 661 |  |  |
Goodwill | 244 |  |  |
Contingent earn-out liabilities | 86 |  |  |
Business combination, working capital adjustment | 8 |  |  |
Business combination, contingent consideration arrangements, range of outcomes, value, high | 250 |  |  |
Silent-Aire | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |
Business Acquisitions |  |  |  |
Reduction in fair value of contingent earn-out liability |  | 43 |  |
Building Solutions EMEA/LA |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 1,725 | 2,041 | 1,987
Goodwill, acquired during period |  | 78 | 35 |
Building Solutions EMEA/LA | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 68 |  |
Global Products |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 5,516 | 5,842 | 5,562
Goodwill, acquired during period |  | 60 | 244 |
Global Products | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 45 |  |
Global Products | Silent-Aire |  |  |  |
Business Acquisitions |  |  |  |
Goodwill, acquired during period | $ 244 |  |  |
Building Solutions Asia Pacific |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 1,116 | 1,237 | 1,223
Goodwill, acquired during period |  | 44 | 0 |
Building Solutions Asia Pacific | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 44 |  |
Building Solutions North America |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | 8,971 | 9,215 | $ 9,160
Goodwill, acquired during period |  | 37 | $ 21 |
Building Solutions North America | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisitions |  |  |  |
Goodwill |  | $ 36 |  |

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