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Cover Page
Nov. 05, 2019
Cover page.  
Document Type 8-K
Document Period End Date Nov. 05, 2019
Entity File Number 001-32260
Entity Registrant Name Westlake Chemical Corporation
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 76-0346924
Entity Address, Address Line One 2801 Post Oak Boulevard,
Entity Address, Address Line Two  Suite 600
Entity Address, City or Town Houston,
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77056
City Area Code 713
Local Phone Number 960-9111
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol WLK
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001262823