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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Net sales $ 3,251 $ 4,483 $ 6,607 $ 8,539
Cost of sales 2,609 3,038 5,173 5,809
Gross profit 642 1,445 1,434 2,730
Selling, general and administrative expenses 213 220 435 420
Amortization of intangibles 30 43 61 85
Restructuring, transaction and integration-related costs 3 7 6 18
Income from operations 396 1,175 932 2,207
Other income (expense)        
Interest expense (42) (44) (84) (90)
Other income, net 23 17 45 28
Income before income taxes 377 1,148 893 2,145
Provision for income taxes 70 275 179 508
Net income 307 873 714 1,637
Net income attributable to noncontrolling interests 10 15 23 23
Net income attributable to Westlake Corporation $ 297 $ 858 $ 691 $ 1,614
Earnings per common share attributable to Westlake Corporation:        
Basic (in dollars per share) $ 2.32 $ 6.65 $ 5.39 $ 12.52
Diluted (in dollars per share) $ 2.31 $ 6.60 $ 5.35 $ 12.43
Weighted average common shares outstanding:        
Basic (in shares) 127,649,341 128,341,132 127,599,093 128,206,988
Diluted (in shares) 128,484,016 129,341,096 128,471,760 129,134,246