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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Sales	$ 479	$ 575	$ 884	$ 1,048
Life Sciences [Member]
Disaggregation Of Revenue [Line Items]
Sales	172	222	306	422
Life Sciences [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	30	73	53	140
Life Sciences [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	69	72	119	136
Life Sciences [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	53	57	99	107
Life Sciences [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	20	20	35	39
Personal Care [Member]
Disaggregation Of Revenue [Line Items]
Sales	146	169	279	298
Personal Care [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	41	45	81	85
Personal Care [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	59	69	104	116
Personal Care [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	30	31	60	57
Personal Care [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	16	24	34	40
Specialty Additives [Member]
Disaggregation Of Revenue [Line Items]
Sales	134	157	249	279
Specialty Additives [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	46	46	86	88
Specialty Additives [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	48	63	82	103
Specialty Additives [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	33	40	67	74
Specialty Additives [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	7	8	14	14
Intermediates [Member]
Disaggregation Of Revenue [Line Items]
Sales	37	40	71	73
Intermediates [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	25	27	48	52
Intermediates [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	6	6	11	10
Intermediates [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	4	6	8	9
Intermediates [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	$ 2	$ 1	$ 4	$ 2

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