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Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]        
Cost of goods sold $ 479 $ 455    
Restructuring reserve 1 4 $ 0 $ 15
Exxaro [Member] | Maximum [Member]        
Related Party Transaction [Line Items]        
Selling, general and administrative expenses to related party transaction 1 1    
Amount to related party capitalized in property, plant and equipment 1 1    
Related party payables 1   1  
ANSAC [Member]        
Related Party Transaction [Line Items]        
Selling, general and administrative expenses to related party transaction 1 1    
Related party payables 1   1  
Net sales to related party 75 60    
Related party receivable 57   60  
ANSAC [Member] | Freight Costs [Member]        
Related Party Transaction [Line Items]        
Related party payables     1  
ANSAC [Member] | Freight Costs [Member] | Maximum [Member]        
Related Party Transaction [Line Items]        
Cost of goods sold 1 $ 2    
Related party payables 1      
Natronx [Member]        
Related Party Transaction [Line Items]        
Related party receivable $ 0      
Ownership interest acquired 33.33%      
Restructuring reserve $ 1   1  
Natronx [Member] | Maximum [Member]        
Related Party Transaction [Line Items]        
Related party receivable     $ 1