Goodwill and Other Intangibles - Summary of Goodwill by Reportable Segment (Details) $ in Millions	6 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,312
Currency translation	73
Balance at end of period	1,385
Life Sciences [Member]
Goodwill [Roll Forward]
Balance at beginning of period	787
Currency translation	45
Balance at end of period	832
Personal Care [Member]
Goodwill [Roll Forward]
Balance at beginning of period	118	[1]
Currency translation	6	[1]
Balance at end of period	124	[1]
Specialty Additives [Member]
Goodwill [Roll Forward]
Balance at beginning of period	407	[1]
Currency translation	22	[1]
Balance at end of period	429	[1]
Intermediates [Member]
Goodwill [Roll Forward]
Balance at beginning of period	0	[1]
Currency translation	0	[1]
Balance at end of period	$ 0	[1]

[1] As of March 31, 2023 and September 30, 2022, there were accumulated impairments of $356 million, $174 million and $90 million related to the Personal Care, Specialty Additives and Intermediates reportable segments, respectively.