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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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