0001262823 2026-08-31 2026-08-31 0001262823 wlk:OnePointSixTwoFivePercentageSeniorNotesDueTwentyTwentyNineMemberDomain 2026-08-31 2026-08-31 0001262823 us-gaap:CommonStockMember exch:XNYS 2026-08-31 2026-08-31 0001262823 us-gaap:CommonStockMember exch:XCHI 2026-08-31 2026-08-31 CHX false 0001262823 8-K 2026-08-31 Westlake Corporation DE 001-32260 76-0346924 5444 Westheimer Suite 101 Houston TX 77056 713 960-9111 false false false false Common Stock, $0.01 par value Common Stock, $0.01 par value WLK WLK NYSE 1.625% Senior Notes due 2029 WLK 29 NYSE false