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Assets and Liabilities Held For Sale and Discontinued Operations - Summarized Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income from discontinued operations, net of tax $ 298 $ 287 $ 253
Income from discontinued operations attributable to noncontrolling interest, net of tax 191 165 176
Income from discontinued operations, net of tax (Note 3) 489 452 429
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 4,466 4,462 4,662
Cost of goods sold 3,300 3,295 3,409
Gross profit 1,166 1,167 1,253
Selling, general and administrative expenses 761 794 867
Restructuring and impairment costs 34 15 20
Net financing charges 17 23 8
Equity income 276 262 240
Income from discontinued operations before income taxes 630 597 598
Provision for income taxes on discontinued operations 141 145 169
Income from discontinued operations, net of tax 489 452 429
Income from discontinued operations attributable to noncontrolling interest, net of tax 191 165 176
Income from discontinued operations, net of tax (Note 3) $ 298 $ 287 $ 253