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Acquisitions and Divestitures - Summarized Results of Discontinued Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income from discontinued operations, net of tax | $ 1,789 | $ 489 | $ 452
Income from discontinued operations attributable to noncontrolling interest, net of tax | 219 | 191 | 165
Income from discontinued operations | 1,570 | 298 | 287
Discontinued Operations, Disposed of by Sale | Residential and Light Commercial HVAC Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net sales | 3,790 | 4,466 | 4,462
Cost of goods sold | 2,881 | 3,300 | 3,295
Gross profit | 909 | 1,166 | 1,167
Disposal Group, Including Discontinued Operation, General And Administrative Expense, Including Adjustments | (2,008) |  |
Selling, general and administrative expenses |  | 761 | 794
Restructuring and impairment costs | 30 | 34 | 15
Net financing charges | 5 | 17 | 23
Equity income | 240 | 276 | 262
Income from discontinued operations before income taxes | 3,122 | 630 | 597
Provision for income taxes on discontinued operations | 1,333 | 141 | 145
Income from discontinued operations, net of tax | 1,789 | 489 | 452
Income from discontinued operations attributable to noncontrolling interest, net of tax | 219 | 191 | 165
Income from discontinued operations | $ 1,570 | $ 298 | $ 287

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