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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 429 | 444 | 430 | 446
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 429 | 444 | 430 | 446
Weighted-average common shares outstanding – assuming dilution (in shares) | 431 | 446 | 432 | 448
Common Stock [Member] |  |  |  |
Earnings per common share: |  |  |  |
Net income attributable to Valero stockholders | $ 845 | $ 548 | $ 1,314 | $ 853
Less dividends paid: |  |  |  |
Common stock | 344 | 311 | 688 | 625
Participating securities | 1 | 1 | 2 | 2
Undistributed earnings | $ 500 | $ 236 | $ 624 | $ 226
Weighted-average common shares outstanding (in shares) | 429 | 444 | 430 | 446
Earnings per common share: |  |  |  |
Distributed earnings (in dollars per share) | $ 0.80 | $ 0.70 | $ 1.60 | $ 1.40
Undistributed earnings (in dollars per share) | 1.16 | 0.53 | 1.45 | 0.50
Total earnings per common share (in dollars per share) | $ 1.96 | $ 1.23 | $ 3.05 | $ 1.90
Earnings per common share – assuming dilution: |  |  |  |
Net income attributable to Valero stockholders | $ 845 | $ 548 | $ 1,314 | $ 853
Weighted-average common shares outstanding (in shares) | 429 | 444 | 430 | 446
Common equivalent shares (in shares) | 2 | 2 | 2 | 2
Weighted-average common shares outstanding – assuming dilution (in shares) | 431 | 446 | 432 | 448
Earnings per common share – assuming dilution (in dollars per share) | $ 1.96 | $ 1.23 | $ 3.04 | $ 1.90
Participating Securities [Member] |  |  |  |
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 1 | 2 | 1 | 2
Earnings per common share: |  |  |  |
Distributed earnings (in dollars per share) | $ 0.80 | $ 0.70 | $ 1.60 | $ 1.40
Undistributed earnings (in dollars per share) | 1.16 | 0.53 | 1.45 | 0.50
Total earnings per common share (in dollars per share) | $ 1.96 | $ 1.23 | $ 3.05 | $ 1.90
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 1 | 2 | 1 | 2

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