Related Parties	3 Months Ended
Related Parties	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Parties	Related Parties Exxaro In connection with the Company’s acquisition in 2012 of Exxaro Resources Limited’s (“Exxaro”) mineral sands business, Exxaro was granted a “flip in” right such that following the occurrence of certain events, Exxaro could exercise a put option, or the Company could exercise a call option, whereby Exxaro exchanges its 26% shareholding in the Company’s South African operating subsidiaries which hold the Company’s material mining licenses (the “South African Subsidiaries Interest”) for an additional 7,246,035 of our ordinary shares. On November 26, 2018, the Company, certain of the Company’s subsidiaries and Exxaro entered into the Exxaro Mineral Sands Transaction Completion Agreement which amended the “flip in” rights granted to Exxaro to accelerate the occurrence of the “flip in” upon satisfaction of certain conditions, which have now been satisfied. On February 23, 2021, we exercised our call option to complete the “flip in” transaction, pursuant to which we issued to Exxaro 7,246,035 new ordinary shares of the Company in exchange for Exxaro’s South African Subsidiaries Interest. In addition, on March 1, 2021, Exxaro sold its entire share ownership in us, including the “flip-in” shares, totaling 21,975,315 ordinary shares in an underwritten public offering. Tasnee/Cristal On April 10, 2019, we announced the completion of the acquisition of the TiO2 business of Cristal for $1.675 billion of cash, subject to a working capital and noncurrent liability adjustment, plus 37,580,000 ordinary shares. At March 31, 2021, Cristal International Holdings B.V. (formerly known as Cristal Inorganic Chemical Netherlands Cooperatief W.A.), a wholly-owned subsidiary of Tasnee, continues to own 37,580,000 shares of Tronox, or a 25% ownership interest. In February 2020, Tronox and Cristal resolved the working capital and noncurrent liability adjustment by agreeing that no payment was required by either party. On May 9, 2018, we entered into an Option Agreement with AMIC which is owned equally by Tasnee and Cristal. Under the terms of the Option Agreement, AMIC granted us an option (the “Option”) to acquire 90% of a special purpose vehicle (the “SPV”), to which AMIC’s ownership in a titanium slag smelter facility (the “Slagger”) in The Jazan City for Primary and Downstream Industries in KSA will be contributed together with $322 million of AMIC indebtedness (the “AMIC Debt”). The Option may be exercised if the Slagger achieves certain production criteria related to sustained quality and tonnage of slag produced (the “Option Criteria”). Likewise, AMIC may require us to acquire the Slagger on the same terms if the Option Criteria are satisfied. Furthermore, pursuant to the Option Agreement and during its term, we agreed to lend AMIC and, upon the creation of the SPV, the SPV $125 million for capital expenditures and operational expenses intended to facilitate the start-up of the Slagger (the “Tronox Loans”). At March 31, 2021, we have lent AMIC the Tronox Loans maximum amount of $125 million. We have recorded the $125 million of total principal loan payments and related interest of $7 million within “Other long-term assets” on the unaudited Condensed Consolidated Balance Sheet at March 31, 2021. The Option did not have a significant impact on the financial statements as of or for the periods ended March 31, 2021. On May 13, 2020, we amended the Option Agreement (the "First Amendment") with AMIC to address circumstances in which the Option Criteria cannot be satisfied. Pursuant to the First Amendment, Tronox has the right to acquire the SPV in exchange for its forgiveness of the Tronox Loan, up to $125 million of principal amount and any interest accrued thereon of the Tronox Loans plus or minus 90% of the SPV’s net working capital. The First Amendment did not have a significant impact on our financial statements as of or for the period ended March 31, 2021. Additionally, on May 13, 2020, we amended a Technical Services Agreement that we had entered with AMIC on March 15, 2018, to add project management support services. Under this arrangement, AMIC and its consultants are still responsible for engineering and construction of the Slagger while we provide technical advice and project management services including supervision and management of third party consultants intended to satisfy the Option Criteria. As compensation for these services, Tronox receives a monthly management fee of approximately $1 million, which is recorded in “Other income (expense), net” within the unaudited Condensed Consolidated Statement of Income and in “Prepaid and other assets” on the unaudited Condensed Consolidated Balance Sheet. The monthly management fee is subject to certain success incentives if and when the Slagger achieves the Option Criteria. Tronox recorded approximately $2 million and nil in "Other Income" for the three months ended March 31, 2021 and March 31, 2020, respectively in the unaudited Condensed Consolidated Statement of Income. At March 31, 2021, Tronox had a receivable due from AMIC related to management fee of $1 million that is recorded within “Prepaid and other assets” on the unaudited Condensed Consolidated Balance Sheet. At March 31, 2021 Tronox had a receivable due from Tasnee of $6 million recorded within “Prepaid and other assets” on the unaudited Condensed Consolidated Balance Sheet, which relates primarily to stamp duty taxes paid on behalf of Tasnee and activities pursuant to a transition services agreement. On December 29, 2019, we entered into an agreement with Cristal to acquire certain assets co-located at our Yanbu facility which produces metal grade TiCl4 ("MGT"). Consideration for the acquisition is the assumption by Tronox of a $36 million note payable to Cristal (the "MGT Loan"). The MGT is used at a titanium "sponge" plant facility, 65% of the ownership interests of which are held by Advanced Metal Industries Cluster and Toho Titanium Metal Co. Ltd ("ATTM"), a joint venture between AMIC and Toho Titanium Company Ltd. ATTM uses the TiCl4, which we supply by pipeline, for the production of titanium sponge, a precursor material used in the production of titanium metal. On December 17, 2020 we completed the MGT transaction. Repayment of the $36 million note payable is based on a fixed U.S. dollar per metric ton quantity of MGT delivered by us to ATTM over time and therefore the ultimate maturity date is variable in nature. If ATTM fails to purchase MGT from us under certain contractually agreed upon conditions, then at our election we may terminate the MGT supply agreement with ATTM and will no longer owe any amount under the loan agreement with Cristal. We currently estimate the ultimate maturity to be between approximately five and seven years, subject to actual future MGT production levels. The interest rate on the note payable is based on the SAIBOR plus a premium. As of March 31, 2021, the outstanding balance of the note payable was $35 million, of which $6 million is expected to be paid within the next twelve months. As a result of the transactions we have entered into related to the MGT assets, Tronox recorded $2 million and $1 million for purchase of chlorine gas for the three months ended March 31, 2021 and March 31, 2020, respectively from ATTM and such amounts are recorded in "Cost of goods sold" on the unaudited Condensed Consolidated Statement of Operations. The amount due to ATTM as of March 31, 2021 for the purchase of chlorine gas was $1 million and is recorded within “Accrued liabilities” on the unaudited Condensed Consolidated Balance Sheet. In addition, during the three months ended March 31, 2021 and March 31, 2020, Tronox recorded $10 million and $6 million, respectively, for MGT sales made to ATTM and MGT Loan repayments to Cristal. The MGT sales amounts are recorded in “Net sales” on the unaudited Condensed Consolidated Statement of Operations. At both March 31, 2021 and December 31, 2020, Tronox had a receivable from ATTM of $7 million from MGT sales that is recorded within “Prepaid and other assets” on the unaudited Condensed Consolidated Balance Sheet.