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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2025
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions | OpCo sells a significant portion of its ethylene production to Westlake. Sales to related parties were as follows:
|  | Year Ended December 31,
|  | 2025 |  | 2024 |  | 2023
Net sales—Westlake |  | $ | 1,033,276 |  |  | $ | 950,801 |  |  | $ | 1,026,655 |
A significant portion of the Partnership's inputs included in cost of sales are supplied by Westlake. Charges from related parties for significant inputs included in cost of sales were as follows:
|  | Year Ended December 31,
|  | 2025 |  | 2024 |  | 2023
Feedstock purchased from Westlake and included in cost of sales |  | $ | 382,698 |  |  | $ | 310,856 |  |  | $ | 398,700 |
Other charges from Westlake and included in cost of sales |  | 133,824 |  |  | 125,702 |  |  | 123,039 |
Charges from related parties included within selling, general and administrative expenses were as follows:
|  | Year Ended December 31,
|  | 2025 |  | 2024 |  | 2023
Services received from Westlake and included in selling, general and administrative expenses |  | $ | 25,017 |  |  | $ | 25,654 |  |  | $ | 27,085 |
Charges from related parties for goods and services capitalized as assets were as follows:
|  | Year Ended December 31,
|  | 2025 |  | 2024 |  | 2023
Goods and services purchased from Westlake and capitalized as assets |  | $ | 7,311 |  |  | $ | 2,295 |  |  | $ | 3,660 |
The Partnership's receivable under the Investment Management Agreement was as follows:
|  | December 31, |  |
|  | 2025 |  | 2024 |  |
Receivable under the Investment Management Agreement |  | $ | 23,378 |  |  | $ | 134,557 |  |  |
The Partnership's accounts receivable from Westlake were as follows:
|  | December 31,
|  | 2025 |  | 2024
Accounts receivable—Westlake |  | $ | 63,571 |  |  | $ | 31,975 |
The Partnership's accounts payable to Westlake were as follows:
|  | December 31,
|  | 2025 |  | 2024
Accounts payable—Westlake |  | $ | 19,132 |  |  | $ | 20,744 |
Debt payable to related parties was as follows:
|  | December 31,
|  | 2025 |  | 2024
Long-term debt payable to Westlake |  | $ | 399,674 |  |  | $ | 399,674 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
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