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Related Parties (Details) - USD ($)
3 Months Ended
Mar. 01, 2021
Feb. 23, 2021
May 13, 2020
Apr. 10, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 17, 2020
Dec. 29, 2019
May 09, 2019
May 09, 2018
Related Parties [Abstract]                      
Shares owned (in shares)         153,257,799   143,557,479        
Other income (expense), net         $ (10,000,000) $ 10,000,000          
Prepaid and other assets         163,000,000   $ 200,000,000        
MGT Loan                      
Related Parties [Abstract]                      
Notes payable         35,000,000     $ 36,000,000      
Notes payable, current         $ 6,000,000            
Minimum | MGT Loan                      
Related Parties [Abstract]                      
Debt instrument, term         5 years            
Maximum | MGT Loan                      
Related Parties [Abstract]                      
Debt instrument, term         7 years            
Cristal's Titanium Dioxide Business                      
Related Parties [Abstract]                      
Ownership percentage         25.00%            
Cash consideration for acquisition       $ 1,675,000,000              
Number of ordinary shares to be issued for acquisition (in shares)       37,580,000              
Shares owned (in shares)         37,580,000            
Slagger | Advanced Metal Industries Cluster Company Limited                      
Related Parties [Abstract]                      
Ownership percentage                     90.00%
Loan commitment                     $ 322,000,000
Loan made         $ 125,000,000            
Slagger | Advanced Metal Industries Cluster Company Limited | Other long-term assets                      
Related Parties [Abstract]                      
Interest receivable         7,000,000            
Exxaro                      
Related Parties [Abstract]                      
Sale of stock, number of shares issued in transaction 21,975,315 7,246,035                  
Exxaro | Tronox Sands LLP                      
Related Parties [Abstract]                      
Ownership percentage                   26.00%  
AMIC                      
Related Parties [Abstract]                      
Revenue from related party         10,000,000 6,000,000          
Affiliated Entity | Option Agreement, Amounts to be Reimbursed for Capital Expenditures and Operational Expenses | AMIC                      
Related Parties [Abstract]                      
Amounts receivable from related party                     $ 125,000,000
Affiliated Entity | Amended Options Agreement, Second Option, Loan Amount Forgiven | AMIC | Maximum                      
Related Parties [Abstract]                      
Related party transaction amount     $ 125,000,000                
Affiliated Entity | Amended Options Agreement, Second Option | AMIC                      
Related Parties [Abstract]                      
Percentage of net working capital     90.00%                
Affiliated Entity | Amended Technical Services Agreement, Monthly Management Fee | AMIC                      
Related Parties [Abstract]                      
Revenue from related party     $ 1,000,000                
Other income (expense), net         2,000,000 0          
Prepaid and other assets         1,000,000            
Affiliated Entity | Purchase of Chlorine Gas                      
Related Parties [Abstract]                      
Purchases from related party         2,000,000 $ 1,000,000          
Affiliated Entity | Purchase of Chlorine Gas | Advanced Metal Industries Cluster and Toho Titanium Metal Co. Ltd (ATTM)                      
Related Parties [Abstract]                      
Amount due to related party         1,000,000            
Affiliated Entity | Receivable from TiCl4 Product Sales | AMIC                      
Related Parties [Abstract]                      
Receivable due from related parties         7,000,000   $ 7,000,000        
Affiliated Entity | Advanced Metal Industries Cluster Company Limited | Acquisition of Assets Producing Metal Grade TiCl4                      
Related Parties [Abstract]                      
Notes receivable, related parties                 $ 36,000,000    
Affiliated Entity | Advanced Metal Industries Cluster and Toho Titanium Metal Co. Ltd (ATTM) | Acquisition of Assets Producing Metal Grade TiCl4                      
Related Parties [Abstract]                      
Ownership percentage                 65.00%    
Tasnee                      
Related Parties [Abstract]                      
Receivable due from related parties         $ 6,000,000