Commitment and Contingencies - Legacy Asbestos Liabilities and Insurance Recoveries Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2026	Sep. 30, 2025
Business Interruption Loss [Line Items]
Net exposure	$ (145)	$ (151)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent
Business Interruption Loss [Line Items]
Insurance settlements receivable	251	268
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent
Business Interruption Loss [Line Items]
Liability for asbestos and environmental claims, gross	(33)	(34)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Business Interruption Loss [Line Items]
Liability for asbestos and environmental claims, gross	(384)	(407)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ReceivablesNetCurrent
Business Interruption Loss [Line Items]
Insurance settlements receivable	$ 21	$ 22

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 30
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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