Related Parties - Schedule of Purchases of Chlorine Gas (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Purchase of Chlorine Gas \| Related party payables
Related Party Transaction [Line Items]
Purchases of chlorine gas	$ 2	$ 2	$ 6	$ 6

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.

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+ Details