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Assets and Liabilities Held for Sale and Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
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Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |
Current assets held for sale | $ 1,856 | $ 1,595
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |
Noncurrent assets held for sale | 3,101 | 3,210
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |
Current liabilities held for sale | 1,544 | 1,431
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |
Noncurrent liabilities held for sale | 429 | 405
Discontinued Operations, Disposed of by Sale | Residential and Light Commercial HVAC Business |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |
Cash | 4 | 5
Accounts receivable - net | 613 | 592
Inventories | 1,080 | 876
Other current assets | 159 | 122
Current assets held for sale | 1,856 | 1,595
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |
Property, plant and equipment - net | 760 | 793
Goodwill | 1,149 | 1,182
Other intangible assets - net | 96 | 96
Investments in partially-owned affiliates | 910 | 949
Other noncurrent assets | 186 | 190
Noncurrent assets held for sale | 3,101 | 3,210
Total assets classified as held for sale | 4,957 | 4,805
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |
Accounts payable | 980 | 917
Accrued compensation and benefits | 78 | 113
Deferred revenue | 206 | 84
Other current liabilities | 280 | 317
Current liabilities held for sale | 1,544 | 1,431
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |
Pension and postretirement benefit obligations | 27 | 28
Other noncurrent liabilities | 402 | 377
Noncurrent liabilities held for sale | 429 | 405
Total liabilities classified as held for sale | $ 1,973 | $ 1,836

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