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Significant Restructuring Costs Change in Restructuring Reserve - 2021 Restructuring Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs | $ 121 | $ 79 | $ 554 | $ 175 |
2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs | 59 |  | 135 |  | $ 242
Restructuring and Related Cost, Total Expected Cost | 385 |  | 385 |  |
Restructuring and Related Cost, Cost Incurred to Date | 377 |  | 377 |  |
Payments for Restructuring |  |  | (98) |  | (79)
Restructuring Reserve, Settled without Cash |  |  | (11) |  | (98)
Currency Translation |  |  | (1) |  |
Restructuring Reserve | 90 |  | 90 |  | 65
2021 Restructuring Plan | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 89 |  | 68
Payments for Restructuring |  |  | (56) |  | (28)
Restructuring Reserve, Settled without Cash |  |  | 0 |  | 0
Currency Translation |  |  | (1) |  |
Restructuring Reserve | 72 |  | 72 |  | 40
2021 Restructuring Plan | Long-Lived Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 11 |  | 98
Payments for Restructuring |  |  | 0 |  | 0
Restructuring Reserve, Settled without Cash |  |  | (11) |  | (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 |  |  | (42) |  | (51)
Restructuring Reserve, Settled without Cash |  |  | 0 |  | 0
Currency Translation |  |  | 0 |  |
Restructuring Reserve | 18 |  | 18 |  | $ 25
2021 Restructuring Plan | Building Solutions North America |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 30 |  |
Restructuring and Related Cost, Cost Incurred to Date | 100 |  | 100 |  |
2021 Restructuring Plan | Building Solutions EMEA/LA |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 32 |  |
Restructuring and Related Cost, Cost Incurred to Date | 61 |  | 61 |  |
2021 Restructuring Plan | Building Solutions Asia Pacific |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 15 |  |
Restructuring and Related Cost, Cost Incurred to Date | 43 |  | 43 |  |
2021 Restructuring Plan | Global Products |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 47 |  |
Restructuring and Related Cost, Cost Incurred to Date | 138 |  | 138 |  |
2021 Restructuring Plan | Corporate Segment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 11 |  |
Restructuring and Related Cost, Cost Incurred to Date | $ 35 |  | $ 35 |  |

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