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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,094	$ 2,057
Business acquisitions		13
Business divestiture	(5)
Currency translation and other	75	24
Goodwill, ending balance	2,164	2,094
Americas
Goodwill [Roll Forward]
Goodwill, beginning balance	609	607
Business acquisitions		0
Business divestiture	0
Currency translation and other	(3)	2
Goodwill, ending balance	606	609
EMEA
Goodwill [Roll Forward]
Goodwill, beginning balance	317	295
Business acquisitions		0
Business divestiture	0
Currency translation and other	24	22
Goodwill, ending balance	341	317
Asia
Goodwill [Roll Forward]
Goodwill, beginning balance	1,168	1,155
Business acquisitions		13
Business divestiture	(5)
Currency translation and other	54	0
Goodwill, ending balance	$ 1,217	$ 1,168

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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