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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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