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Related Parties (Details)
$ / shares in Units, R in Millions, $ in Millions
3 Months Ended
May 09, 2019
USD ($)
$ / shares
shares
Apr. 10, 2019
USD ($)
shares
Feb. 15, 2019
ZAR (R)
Feb. 15, 2019
USD ($)
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 29, 2019
USD ($)
May 09, 2018
USD ($)
Related Parties [Abstract]                
Ownership percentage         26.00%      
Number of shares held by affiliate (in shares) | shares         14,700,000      
Number of ordinary shares to be issued for acquisition (in shares) | shares   37,580,000,000,000            
Shares owned (in shares) | shares         143,366,438 141,900,459    
Transition Services Agreement                
Related Parties [Abstract]                
Reduction in selling, general and administrative expenses         $ 1      
Cristal's Titanium Dioxide Business                
Related Parties [Abstract]                
Ownership percentage         26.00%      
Cash consideration for acquisition   $ 1,675            
Number of ordinary shares to be issued for acquisition (in shares) | shares   37,580,000            
Shares owned (in shares) | shares         37,580,000      
Slagger | Advanced Metal Industries Cluster Company Limited                
Related Parties [Abstract]                
Ownership percentage               90.00%
Loan commitment               $ 322
Loan made         $ 89      
Slagger | Advanced Metal Industries Cluster Company Limited | Other long-term assets                
Related Parties [Abstract]                
Interest receivable         $ 4      
Tronox Sands LLP                
Related Parties [Abstract]                
Payments to acquire interest in subsidiaries       $ 148        
Exxaro                
Related Parties [Abstract]                
Amount due to related party           $ 4    
Ownership percentage         10.30%      
Exxaro | Exxaro Mineral Sands Transaction Completion Agreement                
Related Parties [Abstract]                
Stock repurchased, during period (in shares) | shares 14,000,000              
Stock repurchased during period $ 200              
Stock repurchased, price per share (in dollars per share) | $ / shares $ 14.319              
Stock repurchase fees $ 1              
Discount percentage on volume weighted average share price 5.00%              
Number of weighted average days 10 days              
Exxaro | Tronox Sands LLP                
Related Parties [Abstract]                
Ownership percentage     26.00% 26.00%        
Payments to acquire interest in subsidiaries | R     R 2,060          
Exxaro | South African Subsidiaries                
Related Parties [Abstract]                
Ownership percentage         26.00%      
Tasnee                
Related Parties [Abstract]                
Amount due to related party         $ 4      
Receivable due from related parties         15      
AMIC                
Related Parties [Abstract]                
Product sales         6      
Affiliated Entity | Receivable from TiCl4 Product Sales | AMIC                
Related Parties [Abstract]                
Receivable due from related parties         2      
Affiliated Entity | Purchase of Chlorine Gas                
Related Parties [Abstract]                
Purchases from related party         1      
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      
Affiliated Entity | Advanced Metal Industries Cluster Company Limited | Acquisition of Assets Producing Metal Grade TiCl4                
Related Parties [Abstract]                
Notes receivable, related parties             $ 36