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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation Of Revenue [Line Items]
Sales	$ 482	$ 479	$ 868	$ 884
Life Sciences [Member]
Disaggregation Of Revenue [Line Items]
Sales	172	172	311	306
Life Sciences [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	32	30	59	53
Life Sciences [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	68	69	117	119
Life Sciences [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	53	53	99	99
Life Sciences [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	19	20	36	35
Personal Care [Member]
Disaggregation Of Revenue [Line Items]
Sales	150	146	273	279
Personal Care [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	38	41	68	81
Personal Care [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	60	59	106	104
Personal Care [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	33	30	64	60
Personal Care [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	19	16	35	34
Specialty Additives [Member]
Disaggregation Of Revenue [Line Items]
Sales	134	134	236	249
Specialty Additives [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	43	46	79	86
Specialty Additives [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	47	48	79	82
Specialty Additives [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	36	33	64	67
Specialty Additives [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	8	7	14	14
Intermediates [Member]
Disaggregation Of Revenue [Line Items]
Sales	35	37	66	71
Intermediates [Member] | North America [Member]
Disaggregation Of Revenue [Line Items]
Sales	25	25	44	48
Intermediates [Member] | Europe [Member]
Disaggregation Of Revenue [Line Items]
Sales	5	6	10	11
Intermediates [Member] | Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Sales	3	4	8	8
Intermediates [Member] | Latin America & Other [Member]
Disaggregation Of Revenue [Line Items]
Sales	$ 2	$ 2	$ 4	$ 4

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