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Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings (loss) per common share |  |  |  |
Net income (loss) attributable to Valero stockholders | $ (464) | $ 609 | $ (1,062) | $ 1,362
Less: Income allocated to participating securities | 1 | 1 | 4 | 3
Net income (loss) available to common stockholders | $ (465) | $ 608 | $ (1,066) | $ 1,359
Weighted-average common shares outstanding (in shares) | 407 | 412 | 407 | 415
Earnings (loss) per common share (in dollars per share) | $ (1.14) | $ 1.48 | $ (2.62) | $ 3.28
Earnings (loss) per common share – assuming dilution |  |  |  |
Net income (loss) attributable to Valero stockholders | $ (464) | $ 609 | $ (1,062) | $ 1,362
Less: Income allocated to participating securities | 1 | 1 | 4 | 3
Net income (loss) available to common stockholders | $ (465) | $ 608 | $ (1,066) | $ 1,359
Weighted-average common shares outstanding (in shares) | 407 | 412 | 407 | 415
Effect of dilutive securities (in shares) | 0 | 1 | 0 | 1
Weighted-average common shares outstanding – assuming dilution (in shares) | 407 | 413 | 407 | 416
Earnings (loss) per common share – assuming dilution (in dollars per share) | $ (1.14) | $ 1.48 | $ (2.62) | $ 3.28

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