Restructuring - Recorded Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Restructuring Cost and Reserve [Line Items]
Total	$ 42	$ 8	$ 7	$ 3	$ 57	$ 6
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Total	40			2	53	4
Selling and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 2			$ 1	$ 4	1
Research and Technical Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Total						$ 1

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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