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Employee Benefit Plans, Defined Contribution Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Benefit Plans (Textual) |  |  |
Contributions to defined contribution plans | $ 80 | $ 77 | $ 74

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Period Type: | duration

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- Definition Employee Benefit Plans, Textual [Abstract] + References No definition available. + Details
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Namespace Prefix: | vlo_
Data Type: | xbrli:stringItemType
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Period Type: | duration