v3.26.1
Westlake Chemical Partners LP (Details) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2014
Related Party Transaction [Line Items]    
Partners' capital, sold in public offering (in shares)   12,937,500
Subsidiary of Common Parent | Limited Partner | Westlake Chemical OpCo LP    
Related Party Transaction [Line Items]    
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest 22.80%  
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 77.20%  
Subsidiary of Common Parent | Limited Partner | Westlake Chemical Partners LP    
Related Party Transaction [Line Items]    
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 40.10%  
Ownership interest (in shares) 14,122,230