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Deferred Charges and Other Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Charges and Other Assets (Textual)
Other deferred cost, amortization expense	$ 459	$ 444	$ 383

X

- Definition

Amount of other deferred costs charged against earnings in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	vlo_DeferredChargesAndOtherAssetsTextualsAbstract
Namespace Prefix:	vlo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration