v3.26.1
Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2026
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss by component for the six months ended June 30, 2026 and 2025 were as follows:
Pension and Other Post-Retirement Benefits Liability, Net of TaxCumulative Foreign Currency
Exchange, Net of Tax
Available-for-sale Securities, Net of Tax
Total
Balances at December 31, 2025$44 $(125)$1 $(80)
Net other comprehensive loss attributable to Westlake Corporation
— (18)(1)(19)
Balances at March 31, 202644 (143)— (99)
Net other comprehensive loss attributable to Westlake Corporation— (17)— (17)
Balance at June 30, 2026$44 $(160)$— $(116)
Balances at December 31, 2024$54 $(198)$— $(144)
Net other comprehensive income attributable to Westlake Corporation— 14 — 14 
Balances at March 31, 202554 (184)— (130)
Net other comprehensive income attributable to Westlake Corporation1 65 — 66 
Balance at June 30, 2025
$55 $(119)$— $(64)