Name:	trox_OperatingLossCarryforwardsExpirationAfterYearFive
Namespace Prefix:	trox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expiring in the next fiscal year following the latest fiscal year.

No definition available.

Name:	trox_OperatingLossCarryforwardsExpirationInNextTwelveMonths
Namespace Prefix:	trox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expiring in the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	trox_OperatingLossCarryforwardsExpirationInYearFive
Namespace Prefix:	trox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expiring in the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	trox_OperatingLossCarryforwardsExpirationInYearFour
Namespace Prefix:	trox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expiring in the third fiscal year following the latest fiscal year.

No definition available.

Name:	trox_OperatingLossCarryforwardsExpirationInYearThree
Namespace Prefix:	trox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expiring in the second fiscal year following the latest fiscal year.

No definition available.

Name:	trox_OperatingLossCarryforwardsExpirationInYearTwo
Namespace Prefix:	trox_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	trox_SummaryOfExpirationOfTaxLossCarryforwardsAbstract
Namespace Prefix:	trox_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

No definition available.

Name:	us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_HerMajestysRevenueAndCustomsHMRCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_AustralianTaxationOfficeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_TaxAndCustomsAdministrationNetherlandsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_MinistryOfTheEconomyFinanceAndIndustryFranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=trox_TaxAndCustomsAdministrationSaudiArabiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_SwissFederalTaxAdministrationFTAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_StateAdministrationOfTaxationChinaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_SecretariatOfTheFederalRevenueBureauOfBrazilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: