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Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
Net sales $ 2,975 $ 3,356
Cost of sales 2,509 2,564
Gross profit 466 792 Close
Selling, general and administrative expenses 209 222 Close
Amortization of intangibles 30 31 Close
Restructuring, transaction and integration-related costs 4 3 CloseClose
Total Operating Expenses 243.0 256.0 0 0 0 Close
Income from operations 223 536 Close
Other income (expense)     Close
Interest expense (40) (42) Close
Total Other Income Expenses 10.0 -20.0 0.0 0 0 Close
Other income, net 50 22 CloseCloseClose
Income before income taxes 233 516 Close
Provision for income taxes 48 109 Close
Net income 185 407 Close
Net income attributable to noncontrolling interests 11 13
Net income attributable to Westlake Corporation $ 174 $ 394
Earnings per common share attributable to Westlake Corporation:    
Basic (in dollars per share) $ 1.35 $ 3.07
Diluted (in dollars per share) $ 1.34 $ 3.05
Weighted average common shares outstanding:    
Basic (in shares) 128,359,983 127,548,287
Diluted (in shares) 129,020,370 128,459,368