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Long-Term Debt - Revolving Credit Facility - Additional Information (Detail) € in Millions, $ in Millions |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 EUR (€)
North American Revolving Credit Facility |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Borrowings on credit facilities |  |  | $ 2,020 | $ 2,020 |
European Revolving Credit Facility |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Borrowings on credit facilities |  |  | $ 2,021 | $ 2,021 |
Kronos Worldwide, Inc. | Global Revolver Credit Facility |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity | $ 225 |  |  |  |
Line of credit, maturity month and year | 2026-04 |  |  |  |
Fixed charge coverage ratio, minimum value |  |  | 100.00% |  |
Repayment of credit facility |  | $ 0 |  |  |
Amount available for borrowing |  | 213 | $ 213 |  |
Borrowings on credit facilities |  | 0 |  |  |
Kronos Worldwide, Inc. | Global Revolver Credit Facility | Minimum [Member] | Variable Rate. |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate on outstanding borrowings |  |  | 1.50% |  |
Kronos Worldwide, Inc. | Global Revolver Credit Facility | Minimum [Member] | Base Rate Option |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate on outstanding borrowings |  |  | 0.50% |  |
Kronos Worldwide, Inc. | Global Revolver Credit Facility | Maximum | Variable Rate. |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate on outstanding borrowings |  |  | 2.00% |  |
Kronos Worldwide, Inc. | Global Revolver Credit Facility | Maximum | Base Rate Option |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate on outstanding borrowings |  |  | 2.00% |  |
Kronos Worldwide, Inc. | Canadian Subsidiary Revolving Borrowings Maximum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity |  | $ 25 | $ 25 |  |
Kronos Worldwide, Inc. | Belgian Subsidiary Revolving Borrowings Maximum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity | € |  |  |  |  | € 30
Kronos Worldwide, Inc. | German Subsidiary Revolving Borrowings Maximum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit maximum borrowing capacity | € |  |  |  |  | € 60

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