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Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended		3 Months Ended	9 Months Ended		1 Months Ended			9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2012 Aruba Refinery [Member]	Mar. 31, 2012 Aruba Refinery [Member]	Sep. 30, 2012 Aruba Refinery [Member]	Sep. 30, 2012 Aruba Refinery [Member]	Mar. 28, 2012 Aruba Refinery [Member]	Sep. 30, 2012 Refining Assets [Member]	Sep. 30, 2012 Inventory Related Assets [Member]	Mar. 31, 2012 Construction in Progress [Member]	Sep. 30, 2012 Construction in Progress [Member]	Sep. 30, 2012 Retail [Member]	Sep. 30, 2012 Retail [Member]
Impairments (Textual)
Non-binding purchase offer									$ 350
Asset impairment losses	0	345	0	956	333	595	333	928		308	25	16	16	12	12
Long-lived assets, fair value														$ 5	$ 5

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_ImpairmentOrDisposalOfTangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Non-binding indication of a third party's interest to purchase an asset or group of assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	vlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant