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Other Financing Arrangements - Schedule of Amount Due to Financing Counterparty (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2026 | Dec. 31, 2025
Debt Disclosure [Abstract] |  |
Amount of inventory financed | $ 50 | $ 50
Accrued and unpaid financing charges | 1 | 2
Total | $ 51 | $ 52

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- Definition Inventory Financing Arrangement, Accrued Interest + References No definition available. + Details
Name: | trox_InventoryFinancingArrangementAccruedInterest
Namespace Prefix: | trox_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Inventory Financing Arrangement, Amount Payable + References No definition available. + Details
Name: | trox_InventoryFinancingArrangementAmountPayable
Namespace Prefix: | trox_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Payments For Inventory Financing Arrangements + References No definition available. + Details
Name: | trox_PaymentsForInventoryFinancingArrangements
Namespace Prefix: | trox_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration