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Earnings Per Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in millions) | 540 | 549 | 544 | 550
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in millions) | 540 | 549 | 544 | 550
Common equivalent shares: |  |  |  |
Weighted-average common shares outstanding – assuming dilution (in millions) | 545 | 556 | 549 | 556
Common Stock [Member] |  |  |  |
Earnings per common share: |  |  |  |
Net income attributable to Valero stockholders | $ 312 | $ 674 | $ 1,432 | $ 1,073
Less dividends paid: |  |  |  |
Common stock | 121 | 96 | 340 | 261
Nonvested restricted stock | 1 | 1 | 2 | 2
Undistributed earnings | 190 | 577 | 1,090 | 810
Weighted-average common shares outstanding (in millions) | 540 | 549 | 544 | 550
Earnings per common share: |  |  |  |
Distributed earnings (in usd per share) | $ 0.23 | $ 0.18 | $ 0.63 | $ 0.48
Undistributed earnings (in usd per share) | $ 0.35 | $ 1.04 | $ 1.99 | $ 1.46
Total earnings per common share (in usd per share) | $ 0.58 | $ 1.22 | $ 2.62 | $ 1.94
Earnings per common share – assuming dilution: |  |  |  |
Net income attributable to Valero stockholders | $ 312 | $ 674 | $ 1,432 | $ 1,073
Weighted-average common shares outstanding (in millions) | 540 | 549 | 544 | 550
Common equivalent shares: |  |  |  |
Stock options (in shares) | 3 | 4 | 3 | 4
Performance awards and nonvested restricted stock (in shares) | 2 | 3 | 2 | 2
Weighted-average common shares outstanding – assuming dilution (in millions) | 545 | 556 | 549 | 556
Earnings per common share – assuming dilution (in usd per share) | $ 0.57 | $ 1.21 | $ 2.61 | $ 1.93
Restricted Stock [Member] |  |  |  |
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in millions) | 3 | 3 | 3 | 3
Earnings per common share: |  |  |  |
Distributed earnings (in usd per share) | $ 0.23 | $ 0.18 | $ 0.63 | $ 0.48
Undistributed earnings (in usd per share) | $ 0.35 | $ 1.04 | $ 1.99 | $ 1.46
Total earnings per common share (in usd per share) | $ 0.58 | $ 1.22 | $ 2.62 | $ 1.94
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in millions) | 3 | 3 | 3 | 3

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- Definition Dividends declared in the period and the contractual amount of dividends (or interest on participating income bonds) that must be paid per security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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