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Acquisitions (Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
8 Months Ended 12 Months Ended
Aug. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]    
Net sales   $ 7,081
Net income   397
Net income (loss) attributable to noncontrolling interest   23
Net income attributable to Westlake Chemical Corporation   $ 374
Basic (in dollars per share)   $ 2.88
Diluted (in dollars per share)   $ 2.86
Axiall Corporation [Member]    
Business Acquisition [Line Items]    
Divestitures $ 27  
Restructuring Costs 23  
Legal and Settlement Claims, net $ 23