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Accounts and Notes Payable (Notes) | 12 Months Ended
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Dec. 31, 2020
Accounts and Notes Payable [Abstract] |
Accounts Payable and Accrued Liabilities Disclosure [Text Block] | Accounts Payable Accounts payable consist of the following:
|  | December 31, 2020 |  | December 31, 2019
Accounts payable—third parties |  | $ | 529 |  |  | $ | 435 |
Accounts payable to related parties |  | — |  |  | 12 |
Notes payable |  | 7 |  |  | 26 |
Accounts payable |  | $ | 536 |  |  | $ | 473 |

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Accounts and Notes Payable [Abstract] + References No definition available. + Details
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Namespace Prefix: | wlk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration