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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 458 | 491 | 465 | 503
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 458 | 491 | 465 | 503
Common equivalent shares: |  |  |  |
Weighted-average common shares outstanding – assuming dilution (in shares) | 460 | 494 | 467 | 506
Common Class A [Member] |  |  |  |
Earnings per common share: |  |  |  |
Net income attributable to Valero stockholders | $ 613 | $ 1,377 | $ 1,922 | $ 3,692
Less dividends paid: |  |  |  |
Common stock | 275 | 198 | 837 | 606
Participating securities | 1 | 1 | 3 | 2
Undistributed earnings | $ 337 | $ 1,178 | $ 1,082 | $ 3,084
Weighted-average common shares outstanding (in shares) | 458 | 491 | 465 | 503
Earnings per common share: |  |  |  |
Distributed earnings (in usd per share) | $ 0.60 | $ 0.40 | $ 1.80 | $ 1.20
Undistributed earnings (in usd per share) | 0.73 | 2.39 | 2.32 | 6.11
Total earnings per common share (in usd per share) | $ 1.33 | $ 2.79 | $ 4.12 | $ 7.31
Earnings per common share – assuming dilution: |  |  |  |
Net income attributable to Valero stockholders | $ 613 | $ 1,377 | $ 1,922 | $ 3,692
Weighted-average common shares outstanding (in shares) | 458 | 491 | 465 | 503
Common equivalent shares: |  |  |  |
Stock options (in shares) | 1 | 1 | 1 | 2
Performance awards and nonvested restricted stock (in shares) | 1 | 2 | 1 | 1
Weighted-average common shares outstanding – assuming dilution (in shares) | 460 | 494 | 467 | 506
Earnings per common share – assuming dilution (in usd per share) | $ 1.33 | $ 2.79 | $ 4.12 | $ 7.30
Participating Securities [Member] |  |  |  |
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 1 | 2 | 1 | 2
Earnings per common share: |  |  |  |
Distributed earnings (in usd per share) | $ 0.60 | $ 0.40 | $ 1.80 | $ 1.20
Undistributed earnings (in usd per share) | 0.73 | 2.39 | 2.32 | 6.11
Total earnings per common share (in usd per share) | $ 1.33 | $ 2.79 | $ 4.12 | $ 7.31
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 1 | 2 | 1 | 2

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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 60A -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780132-109256 Reference 2: 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=64863997&loc=d3e2740-109256 Reference 3: 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=64863997&loc=d3e2814-109256 Reference 4: 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=64863997&loc=SL5780133-109256 + Details
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