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Restructuring Activities - Summary of Amount of Restructuring Severance Expense Related to Program (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 expense (income)	$ 8	$ 18	$ 10	$ 21
Utilization (cash paid)	(13)	(1)	(15)	(4)
2025 Restructuring program
Restructuring Cost and Reserve [Line Items]
Severance expense (income)	8	0	12	0
Utilization (cash paid)	(5)	0	(6)	0
2023 Restructuring program
Restructuring Cost and Reserve [Line Items]
Severance expense (income)	0	18	(2)	21
Utilization (cash paid)	$ (8)	$ (1)	$ (9)	$ (4)

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- Definition

Severance income and costs.

+ References

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: 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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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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-Topic 230
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 420
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-Section S99
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-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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