XML 63 R48.htm IDEA: XBRL DOCUMENT
v3.20.4

Earnings and Dividends per Share (Tables) | 12 Months Ended
--- | ---
Dec. 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.
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Net income attributable to Westlake Chemical Corporation |  | $ | 330 |  |  | $ | 421 |  |  | $ | 996 |
Less: |  |  |  |  |  |
Net income attributable to participating securities |  | (1) |  |  | (2) |  |  | (5) |
Net income attributable to common shareholders |  | $ | 329 |  |  | $ | 419 |  |  | $ | 991 |
Reconciliation Of Denominator For Basic And Diluted Earnings (Loss) Per Share | The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Weighted average common shares—basic |  | 127,850,592 |  |  | 128,395,184 |  |  | 129,401,823 |
Plus incremental shares from: |  |  |  |  |  |
Assumed exercise of options and vesting of performance stock units |  | 238,466 |  |  | 362,109 |  |  | 583,930 |
Weighted average common shares—diluted |  | 128,089,058 |  |  | 128,757,293 |  |  | 129,985,753 |
Earnings per common share attributable to Westlake Chemical Corporation: |  |  |  |  |  |
Basic |  | $ | 2.57 |  |  | $ | 3.26 |  |  | $ | 7.66 |
Diluted |  | $ | 2.56 |  |  | $ | 3.25 |  |  | $ | 7.62 |
Dividends Per Share | Dividends per Share Dividends per common share for the years ended December 31, 2020, 2019 and 2018 were as follows:
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Dividends per common share |  | $ | 1.0650 |  |  | $ | 1.0250 |  |  | $ | 0.9200 |

X
- 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
Name: | us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Table Text Block] for Dividends Per Share [Table] + References No definition available. + Details
Name: | wlk_DividendsPerShareTableTextBlock
Namespace Prefix: | wlk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Earnings and Dividends Per Share [Abstract] + References No definition available. + Details
Name: | wlk_EarningsandDividendsPerShareAbstract
Namespace Prefix: | wlk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of net income (loss) attributable to common stockholders [Table Text Block] + References No definition available. + Details
Name: | wlk_ScheduleOfNetIncomeLossAttributableToCommonStockholdersTableTextBlock
Namespace Prefix: | wlk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration