Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	$ 42			$ 756
Intangible assets	670			805
Asset held for sale	565			466
Goodwill impairment and non-cash charge	674
Intangible asset impairment		$ 125
Liabilities held for sale	150			51
Asia Pacific
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	42			41
AMERICAS
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill				$ 715
Goodwill impairment and non-cash charge	674
Polymer Chemical Business | AMERICAS
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset held for sale			$ 41
Chemical Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset held for sale	468
Sale Of Dunlop Brand
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset held for sale	$ 97