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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
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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