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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 | Dec. 31, 2024 | Sep. 30, 2024
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Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |
Current assets held for sale | $ 1,658 | $ 1,595
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |
Noncurrent assets held for sale | 2,986 | 3,210
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |
Current liabilities held for sale | 1,322 | 1,431
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |
Noncurrent liabilities held for sale | 407 | 405
Discontinued Operations, Disposed of by Sale | Residential and Light Commercial HVAC Business |  |
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] |  |
Cash | 2 | 5
Accounts receivable - net | 539 | 592
Inventories | 979 | 876
Other current assets | 138 | 122
Current assets held for sale | 1,658 | 1,595
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] |  |
Property, plant and equipment - net | 743 | 793
Goodwill | 1,130 | 1,182
Other intangible assets - net | 94 | 96
Investments in partially-owned affiliates | 833 | 949
Other noncurrent assets | 186 | 190
Noncurrent assets held for sale | 2,986 | 3,210
Total assets classified as held for sale | 4,644 | 4,805
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] |  |
Accounts payable | 887 | 917
Accrued compensation and benefits | 99 | 113
Deferred revenue | 112 | 84
Other current liabilities | 224 | 317
Current liabilities held for sale | 1,322 | 1,431
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] |  |
Pension and postretirement benefit obligations | 25 | 28
Other noncurrent liabilities | 382 | 377
Noncurrent liabilities held for sale | 407 | 405
Total liabilities classified as held for sale | $ 1,729 | $ 1,836

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