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Assets and Liabilities Held For Sale & Discontinued Operations - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Goodwill impairment loss |  | $ 310,000,000 | $ 0 | $ 0
Impairment of intangible assets, finite-lived |  | $ 38,000,000 |  |
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Restructuring and impairment costs |  |
Asset impairment charges |  | $ 555,000,000 | 98,000,000 | 582,000,000
Income from discontinued operations |  | 0 | 124,000,000 | $ 0
Building Solutions North America Retail |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Goodwill impairment loss |  | 235,000,000 |  |
Building Solutions Asia Pacific |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Goodwill impairment loss |  | 0 | $ 0 |
Asset impairment charges |  | 45,000,000 |  |
Power Solutions |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income from discontinued operations | $ 124,000,000 |  |  |
Tax effect of discontinued operation | $ 26,000,000 |  |  |
Business Divestitures, Not Specific | Building Solutions Asia Pacific |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal group, not discontinued operation, loss (gain) on write-down |  | 60,000,000 |  |
Global Retail |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal group, not discontinued operation, loss (gain) on write-down |  | $ 86,000,000 |  |

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