Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ 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 (a)

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

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Number of non-option equity instruments exercised by participants.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

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-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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- Definition

Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

+ References

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance.

+ References

No definition available.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Actual conversion rate of performance shares into common shares

+ References

No definition available.

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Expected Conversion Rate Of Common Stock Shares

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Number of Vesting Tranches Under Performance Awards Granted

+ References

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The increase (decrease) in the number of shares or awards made during the period on other than stock option plans, such as restricted stock or performance awards, related to the divestiture of a business

+ References

No definition available.

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The weighted average fair value per share related to the increase (decrease) in awards made during the period on other than stock option plans, such as restricted stock or performance awards, related to the divestiture of a business.

+ References

No definition available.

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to the satisfaction of vesting conditions under the plan.

+ References

No definition available.

+ Details

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The number of non-option equity instruments that vested during the reporting period

+ References

No definition available.

+ Details

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- Definition

Conversion rate provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	vlo_
Data Type:	num:percentItemType
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- Details

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

- Definition

Stock option award expiration period

+ References

No definition available.

+ Details

Name:	vlo_StockOptionAwardExpirationPeriod
Namespace Prefix:	vlo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based Compensation Arrangements Activity
Stock-based compensation expense	$ 64	$ 58	$ 58
Tax benefit recognized on stock-based compensation expense	22	20	20
Tax benefit realized for tax deductions resulting from exercises and vestings	66	45	35
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow	47	27	23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward
Stock options outstanding as of beginning of year	13,214,728
Number of stock options, granted	201,300
Number of stock options, exercised	(3,837,090)
Number of stock options, expired	(1,780,113)
Options granted on conversion related to separation of retail business	759,268
Stock options outstanding as of end of year	8,558,093	13,214,728
Number of stock options, exercisable as of December 31, 2013	8,037,807
Weighted-average exercise price per share outstanding, beginning balance	$ 28.54
Weighted-average exercise price per share, granted	$ 39.67
Weighted-average exercise price per share, exercised	$ 15.21
Weighted-average exercise price per share, expired	$ 49.45
Weighted-average exercise price per share, options granted on conversion related to separation of retail business	$ 28.84
Weighted-average exercise price per share outstanding, ending balance	$ 27.88	$ 28.54
Weighted-average exercise price per share, exercisable as of December 31, 2013	$ 27.66
Weighted-average remaining contractual term, outstanding as of December 31, 2013	3 years 5 months 25 days
Weighted-average remaining contractual term, exercisable as of December 31, 2013	3 years 1 month 14 days
Aggregate intrinsic value, outstanding as of December 31, 2013	216
Aggregate intrinsic value, exercisable as of December 31, 2013	206
Employee Stock Option [Member]
Summary of Weighted-Average Assumptions Used in Fair Value Measurements
Expected life in years	6 years	6 years	6 years
Expected volatility	49.63%	49.11%	49.30%
Expected dividend yield	2.27%	2.39%	2.28%
Risk-free interest rate	1.77%	0.85%	1.44%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward
Weighted average grant date fair value of stock option	$ 15.83	$ 10.98	$ 10.10
Intrinsic value of stock options exercised	101	78	63
Cash received from exercise of stock options	59	59	49
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Unrecognized share-based compensation cost related to outstanding unvested awards	1
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	2 years
Employee Stock Option [Member] \| Minimum [Member]
Stock Based Compensation (Textual)
Stock option award expiration period	7 years
Employee Stock Option [Member] \| Maximum [Member]
Stock Based Compensation (Textual)
Stock option award expiration period	10 years
Restricted Stock Awards - Nonemployee [Member]
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Restricted Stock [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Nonvested shares or awards, beginning balance	2,920,288
Shares or awards, granted	1,255,742
Awards, vested	(2,113,647)
Shares or awards, forfeited	(31,546)
Shares granted on conversion related to separation of retail business	174,477
Nonvested shares or awards, ending balance	2,205,314	2,920,288
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, beginning balance	$ 24.76
Weighted average grant date fair value, granted	$ 39.55
Weighted average grant date fair value, vested	$ 23.73
Weighted average grant date fair value, forfeited	$ 23.73
Weighted-average grant date fair value, shares granted on conversion related to separation of retail business	$ 23.42
Weighted average grant date fair value, ending balance	$ 32.23	$ 24.76
Stock Based Compensation (Textual)
Unrecognized share-based compensation cost related to outstanding unvested awards	40
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	2 years
Total fair value of restricted stock vested	74	47	32
Restricted Stock [Member] \| Minimum [Member]
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Restricted Stock [Member] \| Maximum [Member]
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	5 years
Performance Awards [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Nonvested shares or awards, beginning balance	989,414
Shares or awards, granted	415,317
Awards, vested	(442,274)
Shares or awards, forfeited	(50,076)
Shares granted on conversion related to separation of retail business	34,784
Nonvested shares or awards, ending balance	947,165	989,414
Vested Awards Other Than Options Rollforward
Vested awards, beginning balance	208,916
Awards, vested	442,274
Awards, converted	(534,515)
Awards, forfeited	116,675
Vested awards, ending balance	0	208,916
Performance Awards Converted [Abstract]
Vested awards converted	651,190
Converted shares issued	534,515
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	1 year
Unrecognized share-based compensation cost related to outstanding unvested awards	16
Total fair value of restricted stock vested	$ 12	$ 3	$ 4
Performance award vesting rights	33.33%
Number of vesting tranches under performance awards granted	3
Performance Awards [Member] \| Award Year 2010 [Member]
Vested Awards Other Than Options Rollforward
Awards, forfeited	0
Performance Awards Converted [Abstract]
Vested awards converted	417,833
Actual conversion rate of common shares	100.00%
Converted shares issued	417,833
Performance Awards [Member] \| Award Year 2011 [Member]
Vested Awards Other Than Options Rollforward
Awards, forfeited	116,675
Performance Awards Converted [Abstract]
Vested awards converted	233,357
Actual conversion rate of common shares	50.00%
Converted shares issued	116,682
Performance Awards [Member] \| Vesting Tranche - Three [Member] \| Award Year 2011 [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	227,565
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$ 38.77
Expected conversion rate of common stock shares	1.00
Performance Awards [Member] \| Vesting Tranche - Two [Member] \| Award Year 2012 [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	105,030
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$ 38.77
Expected conversion rate of common stock shares	1.00
Performance Awards [Member] \| Vesting Tranche - One [Member] \| Award Year 2013 [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	82,722
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$ 38.77
Expected conversion rate of common stock shares	1.00
Performance Awards [Member] \| Minimum [Member]
Stock Based Compensation (Textual)
Performance awards range of conversion rates	0.00%
Performance Awards [Member] \| Maximum [Member]
Stock Based Compensation (Textual)
Performance awards range of conversion rates	200.00%
Omnibus Stock Incentive Plan [Member] \| Stock Compensation Plan [Member]
Stock Based Compensation (Textual)
Number of shares of common stock available to be awarded under stock-based compensation plans	15,340,981
Formerly Maintained Plans [Member] \| Stock Compensation Plan [Member]
Stock Based Compensation (Textual)
Number of shares of common stock available to be awarded under stock-based compensation plans	0