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Restructuring Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]          
Charges recorded in restructuring expense $ 0 $ 2      
Reversal of restructuring expense (1)        
Sodium Chlorate Plant [Member]          
Restructuring Cost and Reserve [Line Items]          
Cumulative restructuring expenses incurred to date 4        
Wyoming Restructure [Member]          
Restructuring Cost and Reserve [Line Items]          
Cumulative restructuring expenses incurred to date 1        
Reduction in Employees [Member] | Sodium Chlorate Plant [Member]          
Restructuring Cost and Reserve [Line Items]          
Charges recorded in restructuring expense         $ 4
Payments for restructuring   2   $ 1 1
Process Improvements [Member] | Wyoming Restructure [Member]          
Restructuring Cost and Reserve [Line Items]          
Charges recorded in restructuring expense 1        
TiO2 Segment [Member]          
Restructuring Cost and Reserve [Line Items]          
Charges recorded in restructuring expense 0 1      
Cumulative restructuring expenses incurred to date $ 16        
TiO2 Segment [Member] | Reduction in Employees and Outside Contractor Positions [Member]          
Restructuring Cost and Reserve [Line Items]          
Charges recorded in restructuring expense         14
Payments for restructuring   11 $ 3   $ 2
TiO2 Segment [Member] | Reduction in Employees [Member]          
Restructuring Cost and Reserve [Line Items]          
Charges recorded in restructuring expense   $ 2