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Accrued Expenses and Other Long-Term Liabilities, Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligations Rollforward Analysis
Balance as of beginning of year	$ 31us-gaap_AssetRetirementObligation	$ 108us-gaap_AssetRetirementObligation	$ 87us-gaap_AssetRetirementObligation
Additions to accrual	60us-gaap_AssetRetirementObligationLiabilitiesIncurred	2us-gaap_AssetRetirementObligationLiabilitiesIncurred	14us-gaap_AssetRetirementObligationLiabilitiesIncurred
Revisions in estimated cash flows	0us-gaap_AssetRetirementObligationRevisionOfEstimate	0us-gaap_AssetRetirementObligationRevisionOfEstimate	13us-gaap_AssetRetirementObligationRevisionOfEstimate
Accretion expense	1us-gaap_AssetRetirementObligationAccretionExpense	2us-gaap_AssetRetirementObligationAccretionExpense	5us-gaap_AssetRetirementObligationAccretionExpense
Settlements	(1)us-gaap_AssetRetirementObligationLiabilitiesSettled	(1)us-gaap_AssetRetirementObligationLiabilitiesSettled	(11)us-gaap_AssetRetirementObligationLiabilitiesSettled
Separation of retail business	0vlo_AccrualforAssetRetirementObligationsIncreaseDecreaseforAcquisitionsandDivestitures	(80)vlo_AccrualforAssetRetirementObligationsIncreaseDecreaseforAcquisitionsandDivestitures	0vlo_AccrualforAssetRetirementObligationsIncreaseDecreaseforAcquisitionsandDivestitures
Balance as of end of year	$ 91us-gaap_AssetRetirementObligation	$ 31us-gaap_AssetRetirementObligation	$ 108us-gaap_AssetRetirementObligation
Retail Location [Member]
Asset Retirement Obligations (Textual)
Property, plant, and equipment, useful life	20 years

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(4)

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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The Increase or Decrease in the accrual for asset retirement obligations in the period arising from business acquisitions or divestitures.

+ References

No definition available.

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