Restructuring - Restructuring Activities and Related Reserves (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]
Reserve balance	$ 9	$ 8	$ 8		$ 8
Charges	42	8	7	$ 3	57	$ 6
Costs charged against assets	(31)	(5)	(3)
Cash paid	(9)	(2)	(4)
Reserve balance	11	9	8		11
Severance and Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	9	8	7		7
Charges	10	3	4
Cash paid	(8)	(2)	(3)
Reserve balance	11	9	8		11
Non-Cash Asset Impairment and Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance		0	0		0
Charges	31	5	3
Costs charged against assets	(31)	(5)	(3)
Reserve balance			0
Other [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance		$ 0	1		$ 1
Charges	1
Cash paid	$ (1)		(1)
Reserve balance			$ 0

- 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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