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Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative effect of accounting change
Common Stock
Common Stock, Held in Treasury
Additional Paid-in Capital
Retained Earnings
Retained Earnings
Cumulative effect of accounting change
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Beginning balances at Dec. 31, 2017 $ 5,369 $ 1 $ 1 $ (302) $ 555 $ 4,613 $ 1 $ 7 $ 495
Beginning balance, shares issued at Dec. 31, 2017     134,651,380            
Beginning balance, Treasury Stock, Shares at Dec. 31, 2017       5,232,875          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Reclassification of certain tax effects to retained earnings 0         (13)   13  
Net income attributable to Westlake Chemical Corporation 996         996      
Net income attributable to noncontrolling interests 38               38
Net income 1,034                
Other comprehensive loss (84)             (82) (2)
Common stock repurchased, shares       1,368,881          
Common stock repurchased (106)     $ (106)          
Shares issued—stock- based compensation, shares     0 (418,631)          
Shares issued—stock-based compensation 9   $ 0 $ 26 (17)        
Stock-based compensation (in shares)       0          
Stock-based compensation 18     $ 0 18        
Dividends declared (120)         (120)      
Distributions to noncontrolling interests (45)               (45)
Ending balances at Dec. 31, 2018 6,076   $ 1 $ (382) 556 5,477   (62) 486
Ending balance, shares issued at Dec. 31, 2018     134,651,380            
Ending balance, Treasury Stock, Shares at Dec. 31, 2018       6,183,125          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income attributable to Westlake Chemical Corporation 421         421      
Net income attributable to noncontrolling interests 41               41
Net income 462                
Other comprehensive loss (11)             (12) 1
Common stock repurchased, shares       517,712          
Common stock repurchased (30)     $ (30)         0
Shares issued—stock- based compensation, shares     0 (434,228)          
Shares issued—stock-based compensation 1   $ 0 $ 35 (25) (9)      
Stock-based compensation (in shares)       0          
Stock-based compensation 24     $ 0 24        
Dividends declared (132)         (132)      
Distributions to noncontrolling interests (50)               (50)
Issuance of Westlake Chemical Partners LP common units 63       (2)       65
Ending balances at Dec. 31, 2019 $ 6,403   $ 1 $ (377) 553 5,757   (74) 543
Ending balance, shares issued at Dec. 31, 2019 134,651,380   134,651,380            
Ending balance, Treasury Stock, Shares at Dec. 31, 2019 6,266,609     6,266,609          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income attributable to Westlake Chemical Corporation $ 330         330      
Net income attributable to noncontrolling interests 43               43
Net income 373                
Other comprehensive loss 14             10 4
Common stock repurchased, shares       995,529          
Common stock repurchased (54)     $ (54)         0
Shares issued—stock- based compensation, shares     0 (440,964)          
Shares issued—stock-based compensation $ 5   $ 0 $ 30 (13) (12)      
Stock-based compensation (in shares) (247,414)     0          
Stock-based compensation $ 29     $ 0 29        
Dividends declared (137)         (137)      
Distributions to noncontrolling interests (55)               (55)
Ending balances at Dec. 31, 2020 $ 6,578   $ 1 $ (401) $ 569 $ 5,938   $ (64) $ 535
Ending balance, shares issued at Dec. 31, 2020 134,651,380   134,651,380            
Ending balance, Treasury Stock, Shares at Dec. 31, 2020 6,821,174     6,821,174