Benefit Plans - Asset Allocation (Details)	Dec. 31, 2023
Wyoming Refining plan
Defined Benefit Plan Disclosure [Line Items]
Target	100.00%
Actual	100.00%
Wyoming Refining plan \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target	32.00%
Actual	23.00%
Wyoming Refining plan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target	60.00%
Actual	62.00%
Wyoming Refining plan \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target	8.00%
Actual	15.00%
U.S. Oil plan
Defined Benefit Plan Disclosure [Line Items]
Target	100.00%
Actual	100.00%
U.S. Oil plan \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target	56.00%
Actual	54.00%
U.S. Oil plan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target	43.00%
Actual	46.00%
U.S. Oil plan \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target	1.00%
Actual	0.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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