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Commitments and contingencies - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) customer | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2024 USD ($)
Titanium Dioxide Pigments |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
TiO2 Customers | customer | 3,000 |  |  |
Feedstock |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Minimum purchase commitments | $ | $ 583 |  |  | $ 465
Various Raw Materials and Services |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Minimum purchase commitments | $ | $ 72 |  |  | $ 38
Net Sales | Product Concentration Risk | Titanium Dioxide Pigments |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Approximate percent sales by volume | 90.00% | 92.00% | 92.00% |
Net Sales | Customer Concentration Risk | Titanium Dioxide Pigments | Top ten customers |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Approximate percent sales by volume | 35.00% | 33.00% | 32.00% |
Net Sales | Customer Concentration Risk | Titanium Dioxide Pigments | One customer |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Approximate percent sales by volume | 12.00% | 10.00% | 10.00% |
TiO2 Customers | customer | 1 |  |  |

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