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Equity, Share Activity Rollforward (Details) | 3 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Apr. 30, 2015 | Dec. 31, 2014
Share Activity |  |  |  |
Treasury stock, shares, beginning balance |  |  |  | (159,202,872)us-gaap_TreasuryStockShares
Treasury stock, shares, ending balance | (163,184,575)us-gaap_TreasuryStockShares |  |  | (159,202,872)us-gaap_TreasuryStockShares
Common Stock [Member] |  |  |  |
Share Activity |  |  |  |
Common stock, shares, beginning balance | 673,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 673,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock issuances, shares | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock, shares, ending balance | 673,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 673,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Treasury Stock [Member] |  |  |  |
Share Activity |  |  |  |
Treasury stock, shares, beginning balance | (159,000,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (138,000,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Stock issuances, shares | 2,000,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 2,000,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Treasury stock, shares, ending balance | (163,000,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (140,000,000)us-gaap_TreasuryStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member] |  |  |  |
Share Activity |  |  |  |
Stock repurchases, shares | (1,000,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = vlo_StockBasedCompensationPlansRepurchaseProgramMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 0 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = vlo_StockBasedCompensationPlansRepurchaseProgramMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Treasury Stock [Member] | Common Stock Repurchase Program [Member] |  |  |  |
Share Activity |  |  |  |
Stock repurchases, shares | (5,000,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = vlo_CommonStockRepurchaseProgramMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (4,000,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = vlo_CommonStockRepurchaseProgramMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Subsequent Event [Member] | Treasury Stock [Member] |  |  |  |
Share Activity |  |  |  |
Stock repurchases, shares |  |  | (1,700,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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