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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 |  |  |  |  |

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