Income Taxes |
6 Months Ended |
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Jun. 30, 2026 | |
| Income Tax Disclosure [Abstract] | |
| Income Taxes | Income Taxes The effective income tax rate, on income before income taxes of $338, was 19.8% for the three months ended June 30, 2026 as compared to the effective income tax rate, on loss before income taxes of $125, of (4.8)% for the three months ended June 30, 2025. The effective income tax rate for the three months ended June 30, 2026 of 19.8% was below the statutory rate of 21.0% primarily due to U.S. federal research and development credits available to the Company, partially offset by state and foreign taxes. The effective income tax rate for the three months ended June 30, 2025 was below the statutory rate of 21.0% primarily due to a valuation allowance recorded against Westlake Epoxy Netherlands's net operating loss, for which no tax benefit can be recognized, U.S. federal research and development credits available to the Company, state tax benefits and income attributable to noncontrolling interests, partially offset by an increase in reserves for uncertain tax positions and foreign taxes, and the impact of earnings mix across jurisdictions. These adjustments had an inflated impact on the effective income tax rate due to the pre-tax loss for the three months ended June 30, 2025. The effective income tax rate, on income before income taxes of $148, was 23.0% for the six months ended June 30, 2026 as compared to the effective income tax rate, on loss before income taxes of $159, of (4.4)% for the six months ended June 30, 2025. The effective income tax rate for the six months ended June 30, 2026 was above the statutory rate of 21.0% primarily due to state and foreign taxes, partially offset by U.S. federal research and development credits available to the Company. The effective income tax rate for the six months ended June 30, 2025 was below the statutory rate of 21.0% primarily due to a valuation allowance recorded against Westlake Epoxy Netherlands's net operating loss, for which no tax benefit can be recognized, U.S. federal research and development credits available to the Company, state tax benefits and income attributable to noncontrolling interests, partially offset by an increase in reserves for uncertain tax positions and foreign taxes and the impact of earnings mix across jurisdictions. These adjustments had an inflated impact on the effective income tax rate due to the pre-tax loss for the six months ended June 30, 2025.
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