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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Goodwill [Line Items]
Goodwill, impairment loss		$ 230		$ 230
Goodwill	$ 17,676			17,676		$ 17,936
Amortization of intangible assets	119		$ 111	366	$ 319
Disposal Group, Held-for-sale, Not Discontinued Operations | Air Distribution Technologies
Goodwill [Line Items]
Goodwill, impairment loss	21
Reporting Unit With Current Year Impairment
Goodwill [Line Items]
Goodwill	$ 212			$ 212

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