Benefit Plans - Key Assumptions for Projected Benefit Obligation and Net Periodic Benefit Cost (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2021
Projected benefit obligation:
Rate of compensation increase				3.00%
Wyoming Refining plan
Projected benefit obligation:
Discount rate	2.85%	2.65%	3.30%	3.25%
Rate of compensation increase	0.00%	3.00%	3.00%
Net periodic benefit costs:
Discount rate	3.25%	3.30%	4.20%
Expected long-term rate of return	5.75%	6.25%	6.50%
Rate of compensation increase	3.00%	3.00%	3.00%
U.S. Oil plan
Projected benefit obligation:
Discount rate	2.70%	2.35%	3.10%
Rate of compensation increase	3.00%	3.00%	3.00%
Net periodic benefit costs:
Discount rate	2.35%	3.10%	4.10%
Expected long-term rate of return	6.00%	6.00%	6.00%
Rate of compensation increase	3.00%	3.00%	3.00%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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