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Significant Restructuring Costs Change in Restructuring Reserve - 2021 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs | $ 384 | $ 96 | $ 433 | $ 96 |
2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs | 27 |  | 76 |  | $ 242
Restructuring and Related Cost, Total Expected Cost | 385 |  | 385 |  |
Restructuring and Related Cost, Cost Incurred to Date | 318 |  | 318 |  |
Payments for Restructuring |  |  | (65) |  | (79)
Restructuring Reserve, Settled without Cash |  |  | (4) |  | (98)
Currency Translation |  |  | (1) |  |
Restructuring Reserve | 71 |  | 71 |  | 65
2021 Restructuring Plan | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 37 |  | 68
Payments for Restructuring |  |  | (40) |  | (28)
Restructuring Reserve, Settled without Cash |  |  | 0 |  | 0
Currency Translation |  |  | (1) |  |
Restructuring Reserve | 36 |  | 36 |  | 40
2021 Restructuring Plan | Long-Lived Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 4 |  | 98
Payments for Restructuring |  |  | 0 |  | 0
Restructuring Reserve, Settled without Cash |  |  | (4) |  | (98)
Currency Translation |  |  | 0 |  |
Restructuring Reserve | 0 |  | 0 |  | 0
2021 Restructuring Plan | Other Restructuring |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 35 |  | 76
Payments for Restructuring |  |  | (25) |  | (51)
Restructuring Reserve, Settled without Cash |  |  | 0 |  | 0
Currency Translation |  |  | 0 |  |
Restructuring Reserve | 35 |  | 35 |  | $ 25
2021 Restructuring Plan | Building Solutions North America |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 13 |  |
Restructuring and Related Cost, Cost Incurred to Date | 83 |  | 83 |  |
2021 Restructuring Plan | Building Solutions EMEA/LA |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 10 |  |
Restructuring and Related Cost, Cost Incurred to Date | 39 |  | 39 |  |
2021 Restructuring Plan | Building Solutions Asia Pacific |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 11 |  |
Restructuring and Related Cost, Cost Incurred to Date | 39 |  | 39 |  |
2021 Restructuring Plan | Global Products |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 39 |  |
Restructuring and Related Cost, Cost Incurred to Date | 130 |  | 130 |  |
2021 Restructuring Plan | Corporate Segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 3 |  |
Restructuring and Related Cost, Cost Incurred to Date | $ 27 |  | $ 27 |  |

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