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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 | Jun. 30, 2025 | Sep. 30, 2024
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Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |
Current assets held for sale | $ 1,993 | $ 1,595
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |
Noncurrent assets held for sale | 3,174 | 3,210
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |
Current liabilities held for sale | 1,662 | 1,431
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |
Noncurrent liabilities held for sale | 398 | 405
Discontinued Operations, Held-for-Sale | Residential and Light Commercial HVAC Business |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |
Cash | 2 | 5
Accounts receivable - net | 751 | 592
Inventories | 1,089 | 876
Other current assets | 135 | 122
Current assets held for sale | 1,977 | 1,595
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |
Property, plant and equipment - net | 808 | 793
Goodwill | 1,195 | 1,182
Other intangible assets - net | 98 | 96
Investments in partially-owned affiliates | 769 | 949
Other noncurrent assets | 198 | 190
Noncurrent assets held for sale | 3,068 | 3,210
Total assets classified as held for sale | 5,045 | 4,805
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |
Accounts payable | 1,083 | 917
Accrued compensation and benefits | 101 | 113
Deferred revenue | 125 | 84
Other current liabilities | 339 | 317
Current liabilities held for sale | 1,648 | 1,431
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |
Pension and postretirement benefit obligations | 27 | 28
Other noncurrent liabilities | 362 | 377
Noncurrent liabilities held for sale | 389 | 405
Total liabilities classified as held for sale | $ 2,037 | $ 1,836

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