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Fair Value Measurements, Recurring (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Physical Purchase Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] RINs Fixed-Price Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Physical Purchase Contracts [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] Physical Purchase Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] RINs Fixed-Price Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Physical Purchase Contracts [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Physical Purchase Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] RINs Fixed-Price Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Physical Purchase Contracts [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] Physical Purchase Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] RINs Fixed-Price Contracts [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Netting [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Netting [Member]	Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member]	Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member]
Assets:
Commodity derivative contracts			$ 1,066	$ 1,203			$ 1,036	$ 1,143				$ 30	$ 60				$ 0	$ 0
Physical purchase and fixed-price contracts				11	8	(12)			0	0	0			8	11	(12)			0	0	0
Investments of certain benefit plans			102	98			91	87				0	0				11	11
Foreign currency contracts				1				1					0					0
Total gross fair value, assets			1,164	1,313			1,127	1,231				26	71				11	11
Effect of Counterparty Netting																						(989)	(1,189)
Effect of Collateral Netting																						0	0
Commodity derivative contracts, net assets			77	14
Net Carrying Value on Balance Sheet, Assets			175	124																				0
Cash Collateral Received Not Offset			0	0
Liabilities:
Commodity derivative contracts			1,013	1,208			983	1,138				30	70				0	0
Biofuels blending obligation				10				0					10					0
Foreign currency contracts			3	1			3	1				0	0				0	0
Total gross fair value, liabilities			1,016	1,219			986	1,139				30	80				0	0
Effect of Counterparty Netting																						(989)	(1,189)
Effect of Collateral Netting																						(17)	(13)
Commodity derivative contracts, net liabilities			7	6
Net Carrying Value on Balance Sheet, Liabilities			10	17																				0	0
Cash Collateral Paid Not Offset			(82)	(114)
Fair Value Measurements (Textual)
Fair value asset transfers from Level 1 to Level 2	0	0
Fair value asset transfers from Level 2 to Level 1	$ 0	$ 0

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