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Restructuring and Related Costs - Schedule of Restructuring Reserve by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | $ 254 | $ 418 | $ 293 | $ 763 |
Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 24 |  | 63 |  | $ 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 | 0 |  | 13 |  |
Building Solutions Asia Pacific | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 3 |  | 3 |  |
Global Products | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | 15 |  | 36 |  |
Corporate | Various 2023 Restructuring Plans |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring costs and asset impairment charges | $ 6 |  | $ 7 |  |

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