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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Less dividends paid: |  |
Weighted-average common shares outstanding (in shares) | 448 | 469
Earnings per common share – assuming dilution: |  |
Weighted-average common shares outstanding (in shares) | 448 | 469
Weighted-average common shares outstanding – assuming dilution (in shares) | 451 | 471
Common Class A [Member] |  |
Earnings per common share: |  |
Net income attributable to Valero stockholders | $ 305 | $ 495
Less dividends paid: |  |
Common stock | 314 | 281
Participating securities | 1 | 1
Undistributed earnings (excess distributions over earnings) | $ (10) | $ 213
Weighted-average common shares outstanding (in shares) | 448 | 469
Earnings (loss) per common share: |  |
Distributed earnings (in usd per share) | $ 0.70 | $ 0.60
Undistributed earnings (excess distributions over earnings) (in usd per share) | (0.02) | 0.45
Total earnings per common share (in usd per share) | $ 0.68 | $ 1.05
Earnings per common share – assuming dilution: |  |
Net income attributable to Valero stockholders | $ 305 | $ 495
Weighted-average common shares outstanding (in shares) | 448 | 469
Common equivalent shares (in shares) | 3 | 2
Weighted-average common shares outstanding – assuming dilution (in shares) | 451 | 471
Earnings per common share – assuming dilution (in usd per share) | $ 0.68 | $ 1.05
Participating Securities [Member] |  |
Less dividends paid: |  |
Weighted-average common shares outstanding (in shares) | 2 | 2
Earnings (loss) per common share: |  |
Distributed earnings (in usd per share) | $ 0.70 | $ 0.60
Undistributed earnings (excess distributions over earnings) (in usd per share) | 0.00 | 0.45
Total earnings per common share (in usd per share) | $ 0.70 | $ 1.05
Earnings per common share – assuming dilution: |  |
Weighted-average common shares outstanding (in shares) | 2 | 2

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