v3.26.3
Cover
Sep. 24, 2026
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Sep. 24, 2026
Entity Registrant Name Westlake Corporation
Entity Incorporation, State or Country Code DE
Entity File Number 001-32260
Entity Tax Identification Number 76-0346924
Entity Address, Address Line One 5444 Westheimer
Entity Address, Address Line Two Suite 101
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
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001262823
Common Stock | NEW YORK STOCK EXCHANGE, INC.  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol WLK
Security Exchange Name NYSE
Common Stock | NYSE TEXAS, INC.  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol WLK
Security Exchange Name NYSETX
One Point Six Two Five Percentage Senior Notes Due Twenty Twenty Nine [Domain]  
Document Information [Line Items]  
Title of 12(b) Security 1.625% Senior Notes due 2029
Trading Symbol WLK29
Security Exchange Name NYSE