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Restructuring and Related Costs - Schedule of Restructuring Reserve by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | $ 106 | $ 81 | $ 399 | $ 844 |
Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 40 |  | 103 |  | $ 276
Building Solutions North America | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 0 |  | 4 |  |
Building Solutions EMEA/LA | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 9 |  | 22 |  |
Building Solutions Asia Pacific | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 4 |  | 7 |  |
Global Products | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 20 |  | 56 |  |
Corporate | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | $ 7 |  | $ 14 |  |

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