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Earnings and Dividends per Share (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings and Dividends Per Share [Abstract] |
Schedule Of Net Income Attributable To Common Stockholders | Diluted earnings per share include the effects of certain stock options and performance stock units.
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Net income attributable to Westlake Chemical Corporation |  | $ | 145 |  |  | $ | 72 |
Less: |  |  |  |
Net income attributable to participating securities |  | — |  |  | (1 | )
Net income attributable to common shareholders |  | $ | 145 |  |  | $ | 71 |
Reconciliation Of Denominator For Basic And Diluted Earnings Per Share | The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Weighted average common shares—basic |  | 128,237,364 |  |  | 128,528,480 |
Plus incremental shares from: |  |  |  |
Assumed exercise of options and vesting of performance stock units |  | 205,608 |  |  | 385,441 |
Weighted average common shares—diluted |  | 128,442,972 |  |  | 128,913,921 |
Earnings per common share attributable to Westlake Chemical Corporation: |  |  |  |
Basic |  | $ | 1.13 |  |  | $ | 0.56 |
Diluted |  | $ | 1.13 |  |  | $ | 0.55 |
Dividends Per Share | Dividends per Share Dividends per common share for the three months ended March 31, 2020 and 2019 were as follows:
|  | Three Months Ended March 31,
|  | 2020 |  | 2019
Dividends per common share |  | $ | 0.2625 |  |  | $ | 0.2500 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Schedule of net income (loss) attributable to common stockholders [Table Text Block] + References No definition available. + Details
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