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Significant Restructuring and Impairment Costs (Detail) $ in Millions | 9 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Employees | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2021 USD ($) Employees
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | $ 242 | $ 783 | $ 235 |
Number of employees to be severed | Employees |  |  |  |  | 10,000
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employees |  | 7,800 |  |  | 7,800
Goodwill, Impairment Loss |  | $ 0 | 424 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | 62 |  |
Corporate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 24 | 5 |  |
2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 242 |  |  |
Payments for Restructuring |  | (79) |  |  |
Restructuring Reserve, Settled without Cash |  | (98) |  |  |
Restructuring Reserve |  | 65 |  |  | $ 65
Restructuring and Related Cost, Expected Cost |  | 385 |  |  | 385
2021 Restructuring Plan | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 68 |  |  |
Payments for Restructuring |  | (28) |  |  |
Restructuring Reserve, Settled without Cash |  | 0 |  |  |
Restructuring Reserve |  | 40 |  |  | 40
2021 Restructuring Plan | Fixed Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 98 |  |  |
Payments for Restructuring |  | 0 |  |  |
Restructuring Reserve, Settled without Cash |  | (98) |  |  |
Restructuring Reserve |  | 0 |  |  | 0
2021 Restructuring Plan | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 76 |  |  |
Payments for Restructuring |  | (51) |  |  |
Restructuring Reserve, Settled without Cash |  | 0 |  |  |
Restructuring Reserve |  | 25 |  |  | 25
2020 Restructuring Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 297 |  |
Payments for Restructuring |  | (71) | (95) |  |
Restructuring Reserve, Settled without Cash |  |  | (96) |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  |  | 2 |  |
Restructuring Reserve |  | 37 | 108 |  | 37
2020 Restructuring Plan [Member] | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 196 |  |
Payments for Restructuring |  | (69) | (92) |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  |  | 2 |  |
Restructuring Reserve |  | 37 | 106 |  | 37
2020 Restructuring Plan [Member] | Fixed Asset Impairment |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 96 |  |
Payments for Restructuring |  | 0 | 0 |  |
Restructuring Reserve, Settled without Cash |  |  | (96) |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  |  | 0 |  |
Restructuring Reserve |  | 0 | 0 |  | 0
2020 Restructuring Plan [Member] | Other Restructuring [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 5 |  |
Payments for Restructuring |  | (2) | (3) |  |
Restructuring Reserve, Settled without Cash |  |  | 0 |  |
Restructuring Reserve, Foreign Currency Translation Gain (Loss) |  |  | 0 |  |
Restructuring Reserve |  | 0 | 2 |  | $ 0
Building Solutions Asia Pacific | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 28 | 56 |  |
Goodwill, Impairment Loss |  | 0 | 0 |  |
Building Solutions Asia Pacific | 2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 28 |  |  |
Building Solutions Asia Pacific | 2020 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 49 |  |
Corporate | 2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 24 |  |  |
Corporate | 2020 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 5 |  |
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 29 | 59 |  |
Goodwill, Impairment Loss |  | 0 | 0 |  |
Building Solutions EMEA/LA | 2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 29 |  |  |
Building Solutions EMEA/LA | 2020 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 43 |  |
Building Solutions North America |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  | 424 |  |
Building Solutions North America | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 70 | 520 |  |
Goodwill, Impairment Loss | $ 424 | 0 | 424 |  |
Building Solutions North America | 2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 70 |  |  |
Building Solutions North America | 2020 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | 64 |  |
Global Products | Building Technologies & Solutions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | 91 | 143 | $ 235 |
Goodwill, Impairment Loss |  | 0 | 0 |  |
Global Products | 2021 Restructuring Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  | $ 91 |  |  |
Global Products | 2020 Restructuring Plan [Member] | Continuing Operations [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment costs |  |  | $ 136 |  |

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