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Business and geographic segments - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($)
Business and geographic segments |  |
Number of operating segments | segment | 3 |
Non-U.S. subsidiaries |  |
Business and geographic segments |  |
Net assets of non-U.S. subsidiaries | $ | $ 532 | $ 653
Kronos | Valhi Incorporation |  |
Business and geographic segments |  |
Direct ownership percentage by parent | 50.00% |
Kronos | NL Industries |  |
Business and geographic segments |  |
Indirect controlling interest in subsidiary | 31.00% |
NL Industries | Valhi Incorporation |  |
Business and geographic segments |  |
Direct ownership percentage by parent | 83.00% |
LandWell | Valhi Incorporation |  |
Business and geographic segments |  |
Direct ownership percentage by parent | 27.00% |
LandWell | Basic Management Inc |  |
Business and geographic segments |  |
Indirect controlling interest in subsidiary | 50.00% |
Basic Management Inc | Valhi Incorporation |  |
Business and geographic segments |  |
Direct ownership percentage by parent | 63.00% |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-18 + Details
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