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Restructuring Activities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Restructuring Cost And Reserve [Line Items]
Severance income (expenses)	$ (8)	$ (18)	$ (10)	$ (21)
Specialty Additives Facility [Member]
Restructuring Cost And Reserve [Line Items]
Accelerated depreciation		$ 27		$ 49
Life Sciences [Member]
Restructuring Cost And Reserve [Line Items]
Accelerated depreciation	13		13
Fiscal 2025 and 2023 Restructuring Severance Costs [Member] | Life Sciences [Member]
Restructuring Cost And Reserve [Line Items]
Accelerated depreciation	$ 13		$ 13

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- Definition

Severance income and costs.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

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