Benefit Plans - Asset Allocation (Details)	Dec. 31, 2021
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	54.00%
Actual	56.00%
Wyoming Refining plan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target	35.00%
Actual	31.00%
Wyoming Refining plan \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target	11.00%
Actual	13.00%
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	58.00%
U.S. Oil plan \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target	43.00%
Actual	42.00%
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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