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Litigation and Contingencies (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Dec. 03, 2024	Sep. 30, 2025	Dec. 31, 2024
Site Contingency [Line Items]
Amount related to unreserved tax-related matters, inclusive of interest		$ 99
Loss contingency, other party settlement amount	$ 40
Litigation settlement received		25	$ 15
Elmira Site
Site Contingency [Line Items]
Environmental remediation estimated liability		22
Environmental recoveries receivable		33
Elmira Site | Other Current Liabilities
Site Contingency [Line Items]
Environmental remediation estimated liability		3
Elmira Site | Other Noncurrent Liabilities
Site Contingency [Line Items]
Environmental remediation estimated liability		$ 19

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