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Business segment information - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2025
Facility Closing
Business segment information
Workforce reduction costs accrued	$ 2	$ 2
Accelerated depreciation	$ 10
Kronos | Valhi Incorporation
Business segment information
Direct ownership percentage by parent			50.00%
Kronos | NL Industries
Business segment information
Indirect controlling interest in subsidiary			31.00%
NL Industries | Valhi Incorporation
Business segment information
Direct ownership percentage by parent			83.00%
LandWell | Valhi Incorporation
Business segment information
Direct ownership percentage by parent			27.00%
LandWell | Basic Management Inc
Business segment information
Indirect controlling interest in subsidiary			50.00%
Basic Management Inc | Valhi Incorporation
Business segment information
Direct ownership percentage by parent			63.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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