Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018



	Three Months Ended
	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018
Net sales	$	2,150	$	2,235	$	2,255	$	1,995
Gross profit	542		552		539		354
Income from operations	401		404		396		207
Net income	297		288		318		131
Net income attributable to Westlake Chemical Corporation	287		278		308		123
Earnings per common share attributable to Westlake Chemical Corporation: ⁽¹⁾
Basic	$	2.21	$	2.13	$	2.36	$	0.95
Diluted	$	2.20	$	2.12	$	2.35	$	0.95

	Three Months Ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
Net sales	$	1,943	$	1,979	$	2,109	$	2,010
Gross profit ⁽²⁾	366		403		496		496
Income from operations ⁽²⁾	234		264		364		363
Net income	145		159		219		816
Net income attributable to Westlake Chemical Corporation	138		153		211		802
Earnings per common share attributable to Westlake Chemical Corporation: ⁽¹⁾
Basic	$	1.07	$	1.18	$	1.62	$	6.18
Diluted	$	1.06	$	1.17	$	1.61	$	6.15

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(1)	Basic and diluted earnings per common share ("EPS") for each quarter is computed using the weighted average shares outstanding during that quarter, while EPS for the year is computed using the weighted average shares outstanding for the year. As a result, the sum of the EPS for each of the four quarters may not equal the EPS for the year.


(2)	Immaterial reclassifications were made from cost of sales to other income, net, retrospectively, as a result of the adoption of accounting standard update ("ASU") No. 2017-07 effective January 1, 2018. See Note 1 to the consolidated financial statements.