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Assets and Liabilities Held For Sale and Discontinued Operations - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from discontinued operations | $ 0 | $ 0 | $ 124
Building Solutions Asia Pacific |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset impairment charges | $ 0 | $ 45 |
Power Solutions |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from discontinued operations |  |  | 124
Tax effect of discontinued operation |  |  | $ 26

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