Investments - Narrative (Details) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($) joint_venture	Dec. 31, 2025 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 174	$ 162
Equity method investments, number of joint ventures \| joint_venture	3
Asahi-Schwebel JV
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Quimobásicos JV
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Sinochem Lantian New Materials Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 110	$ 103
Equity method investment, ownership percentage	50.00%
ConverDyn \| ConverDyn \| Variable Interest Entity, Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Variable interest entity, qualitative or quantitative information, ownership percentage	50.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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