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Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Income (loss) on acquisitions and divestitures	$ 0	$ 18	$ 2	$ (165)
Avoca [Member]
Segment Reporting Information [Line Items]
Income (loss) on acquisitions and divestitures		8	2	8
Impairment charge				183
Life Sciences [Member]
Segment Reporting Information [Line Items]
Accelerated depreciation		$ 13		$ 13
Specialty Additives [Member]
Segment Reporting Information [Line Items]
Accelerated depreciation			$ 3

X

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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