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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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