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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Less dividends paid: |  |  |  |
Weighted-average common shares outstanding (in shares) | 425 | 439 | 428 | 444
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 425 | 439 | 428 | 444
Weighted-average common shares outstanding – assuming dilution (in shares) | 427 | 441 | 430 | 446
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 | $ 2.40 | $ 2.10
Undistributed earnings (in dollars per share) | 1.21 | 1.21 | 2.65 | 1.70
Total earnings per common share (in dollars per share) | $ 2.01 | $ 1.91 | $ 5.05 | $ 3.80
Earnings per common share – assuming dilution: |  |  |  |
Weighted-average common shares outstanding (in shares) | 1 | 2 | 1 | 2
Common Stock [Member] |  |  |  |
Earnings per common share: |  |  |  |
Net income attributable to Valero stockholders | $ 856 | $ 841 | $ 2,170 | $ 1,694
Less dividends paid: |  |  |  |
Common stock | 340 | 308 | 1,028 | 933
Participating securities | 1 | 1 | 3 | 3
Undistributed earnings | $ 515 | $ 532 | $ 1,139 | $ 758
Weighted-average common shares outstanding (in shares) | 425 | 439 | 428 | 444
Earnings per common share: |  |  |  |
Distributed earnings (in dollars per share) | $ 0.80 | $ 0.70 | $ 2.40 | $ 2.10
Undistributed earnings (in dollars per share) | 1.21 | 1.21 | 2.65 | 1.70
Total earnings per common share (in dollars per share) | $ 2.01 | $ 1.91 | $ 5.05 | $ 3.80
Earnings per common share – assuming dilution: |  |  |  |
Net income attributable to Valero stockholders | $ 856 | $ 841 | $ 2,170 | $ 1,694
Weighted-average common shares outstanding (in shares) | 425 | 439 | 428 | 444
Common equivalent shares (in shares) | 2 | 2 | 2 | 2
Weighted-average common shares outstanding – assuming dilution (in shares) | 427 | 441 | 430 | 446
Earnings per common share – assuming dilution (in dollars per share) | $ 2.01 | $ 1.91 | $ 5.05 | $ 3.80

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