v3.26.1
Document and Entity Information
Aug. 31, 2026
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Aug. 31, 2026
Entity Registrant Name Westlake Corporation
Entity Incorporation State Country Code DE
Entity File Number 001-32260
Entity Tax Identification Number 76-0346924
Entity Address Address Line 1 5444 Westheimer
Entity Address Address Line 2 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
1.625% Senior Notes due 2029 [Member]  
Document Information [Line Items]  
Security 12b Title 1.625% Senior Notes due 2029
Trading Symbol WLK 29
Security Exchange Name NYSE
The New York Stock Exchange [Member] | Common Stock [Member]  
Document Information [Line Items]  
Security 12b Title Common Stock, $0.01 par value
Trading Symbol WLK
Security Exchange Name NYSE
NYSE Texas [Member] | Common Stock [Member]  
Document Information [Line Items]  
Security 12b Title Common Stock, $0.01 par value
Trading Symbol WLK
Security Exchange Name CHX