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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 444 | 467 | 446 | 468
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 444 | 467 | 446 | 468
Weighted-average common shares outstanding – assuming dilution (in shares) | 446 | 470 | 448 | 471
Common Class A [Member] |  |  |  |
Earnings per common share: |  |  |  |
Net income attributable to Valero stockholders | $ 548 | $ 814 | $ 853 | $ 1,309
Less dividends paid: |  |  |  |
Common stock | 311 | 281 | 625 | 562
Participating securities | 1 | 1 | 2 | 2
Undistributed earnings | $ 236 | $ 532 | $ 226 | $ 745
Weighted-average common shares outstanding (in shares) | 444 | 467 | 446 | 468
Earnings per common share: |  |  |  |
Distributed earnings (in usd per share) | $ 0.70 | $ 0.60 | $ 1.40 | $ 1.20
Undistributed earnings (in usd per share) | 0.53 | 1.14 | 0.50 | 1.59
Total earnings per common share (in usd per share) | $ 1.23 | $ 1.74 | $ 1.90 | $ 2.79
Earnings per common share – assuming dilution: |  |  |  |
Net income attributable to Valero stockholders | $ 548 | $ 814 | $ 853 | $ 1,309
Weighted-average common shares outstanding (in shares) | 444 | 467 | 446 | 468
Common equivalent shares (in shares) | 2 | 3 | 2 | 3
Weighted-average common shares outstanding – assuming dilution (in shares) | 446 | 470 | 448 | 471
Earnings per common share – assuming dilution (in usd per share) | $ 1.23 | $ 1.73 | $ 1.90 | $ 2.78
Participating Securities [Member] |  |  |  |
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 2 | 1 | 2 | 1
Earnings per common share: |  |  |  |
Distributed earnings (in usd per share) | $ 0.70 | $ 0.60 | $ 1.40 | $ 1.20
Undistributed earnings (in usd per share) | 0.53 | 1.14 | 0.50 | 1.59
Total earnings per common share (in usd per share) | $ 1.23 | $ 1.74 | $ 1.90 | $ 2.79
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 2 | 1 | 2 | 1

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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=96947427&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=96947427&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=96947427&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=96947427&loc=SL5780133-109256 + Details
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