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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	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]
Current assets held for sale	$ 1,595	$ 1,552
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]
Noncurrent assets held for sale	3,210	3,105
Total assets classified as held for sale	4,805	4,657	$ 4,700
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]
Current liabilities held for sale	1,431	1,375
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract]
Noncurrent liabilities held for sale	405	407
Discontinued Operations, Disposed of by Sale | Residential and Light Commercial HVAC Business
Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]
Cash	5	7
Accounts receivable - net	592	512
Inventories	876	904
Other current assets	122	129
Current assets held for sale	1,595	1,552
Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract]
Property, plant and equipment - net	793	762
Goodwill	1,182	1,164
Other intangible assets - net	96	116
Investments in partially-owned affiliates	949	905
Other noncurrent assets	190	158
Noncurrent assets held for sale	3,210	3,105
Total assets classified as held for sale	4,805	4,657
Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract]
Short-term debt	0	24
Accounts payable	917	770
Accrued compensation and benefits	113	111
Deferred revenue	84	73
Other current liabilities	317	397
Current liabilities held for sale	1,431	1,375
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract]
Pension and postretirement benefit obligations	28	27
Other noncurrent liabilities	377	380
Noncurrent liabilities held for sale	405	407
Total liabilities classified as held for sale	$ 1,836	$ 1,782

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