XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.20.4

Accounts and Notes Payable (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Accounts and Notes Payable [Abstract] |
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] | 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 |

X
- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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