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Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Less dividends paid: |  |
Common stock | $ 111 | $ 83
Weighted-average common shares outstanding | 550 | 551
Earnings per common share: |  |
Distributed earnings | $ 0.20 | $ 0.15
Earnings per common share – assuming dilution: |  |
Weighted-average common shares outstanding | 550 | 551
Common equivalent shares: |  |
Weighted-average common shares outstanding – assuming dilution | 556 | 551
Common Stock [Member] |  |
Earnings per common share: |  |
Net income (loss) attributable to Valero stockholders | 654 | (432)
Less dividends paid: |  |
Common stock | 110 | 83
Nonvested restricted stock | 1 | 0
Undistributed earnings (loss) | 543 | (515)
Weighted-average common shares outstanding | 550 | 551
Earnings per common share: |  |
Distributed earnings | $ 0.20 | $ 0.15
Undistributed earnings (loss) | $ 0.98 | $ (0.93)
Total earnings per common share | $ 1.18 | $ (0.78)
Earnings per common share – assuming dilution: |  |
Net income (loss) attributable to Valero stockholders | $ 654 | $ (432)
Weighted-average common shares outstanding | 550 | 551
Common equivalent shares: |  |
Stock options | 4 | 0
Performance awards and nonvested restricted stock | 2 | 0
Weighted-average common shares outstanding – assuming dilution | 556 | 551
Earnings per common share – assuming dilution | $ 1.18 | $ (0.78)
Restricted Stock [Member] |  |
Less dividends paid: |  |
Weighted-average common shares outstanding | 3 | 3
Earnings per common share: |  |
Distributed earnings | $ 0.20 | $ 0.15
Undistributed earnings (loss) | $ 0.98 | $ 0.00
Total earnings per common share | $ 1.18 | $ 0.15
Earnings per common share – assuming dilution: |  |
Weighted-average common shares outstanding | 3 | 3

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- Definition The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 61 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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