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Accounts Receivable Securitization Program - Schedule of Receivables Sold and Fees Incurred Under the Program (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Transfers and Servicing [Abstract] |  |  |  |
Cash proceeds from collections reinvested in the program | $ 308 | $ 290 | $ 589 | $ 546
Incremental accounts receivables sold | 328 | 290 | 634 | 561
Fees incurred | $ 4 | $ 3 | $ 7 | $ 7

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- Definition Fees Incurred + References No definition available. + Details
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- Definition Incremental Accounts Receivables Sold + References No definition available. + Details
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Namespace Prefix: | trox_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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