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Acquisitions and Divestitures - Summary of Assets and Liabilities Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets held for sale	$ 14	$ 1,595
Noncurrent assets held for sale	140	3,210
Current liabilities held for sale	12	1,431
Noncurrent liabilities held for sale	$ 9	405
Discontinued Operations, Held-for-Sale | Residential and Light Commercial HVAC Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash		5
Accounts receivable - net		592
Inventories		876
Other current assets		122
Current assets held for sale		1,595
Property, plant and equipment - net		793
Goodwill		1,182
Other intangible assets - net		96
Investments in partially-owned affiliates		949
Other noncurrent assets		190
Noncurrent assets held for sale		3,210
Total assets classified as held for sale		4,805
Accounts payable		917
Accrued compensation and benefits		113
Deferred revenue		84
Other current liabilities		317
Current liabilities held for sale		1,431
Pension and postretirement benefit obligations		28
Other noncurrent liabilities		377
Noncurrent liabilities held for sale		405
Total liabilities classified as held for sale		$ 1,836

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