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Commitments and Contingencies - Approximate Percentage of TiO2 Sales by Volume for Segments (Detail) - TiO2 - Geographic Concentration Risk - Net Sales - Chemicals | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Europe |  |  |
Schedule Of Sales Revenue By Business Segment [Line Items] |  |  |
Concentration risk percentage | 46.00% | 46.00% | 44.00%
North America |  |  |
Schedule Of Sales Revenue By Business Segment [Line Items] |  |  |
Concentration risk percentage | 36.00% | 34.00% | 37.00%

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