Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Summary Of Quarterly Financial Information

	Three Months Ended
	March 31, 2019		June 30, 2019		September 30, 2019		December 31, 2019
Net sales	$	2,025	$	2,144	$	2,066	$	1,883
Gross profit	299		340		371		250
Income from operations	134		194		226		102
Net income	82		129		166		85
Net income attributable to Westlake Chemical Corporation	72		119		158		72
Earnings per common share attributable to Westlake Chemical Corporation:
Basic	$	0.56	$	0.92	$	1.22	$	0.56
Diluted	$	0.55	$	0.92	$	1.22	$	0.56
	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

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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.