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