Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2020
Income Taxes (Textual)
Income tax benefit, expected tax NOL carryback provided for under CARES Act	$ 7	$ 117

Amount of tax benefit attributable to the expected tax NOL carryback provided for under the CARES Act.

No definition available.

Name:	vlo_EffectiveIncomeTaxRateReconciliationNOLCarrybackCARESActAmount
Namespace Prefix:	vlo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration