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
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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