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Earnings Per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Less dividends paid:        
Common stock     $ 220 $ 166
Weighted-average common shares outstanding 543 550 546 550
Earnings per common share:        
Distributed earnings $ 0.20 $ 0.15 $ 0.40 $ 0.30
Earnings per common share – assuming dilution:        
Weighted-average common shares outstanding 543 550 546 550
Common equivalent shares:        
Weighted-average common shares outstanding – assuming dilution 548 555 552 556
Common Stock [Member]
        
Earnings per common share:        
Net income attributable to Valero stockholders 466 831 1,120 399
Less dividends paid:        
Common stock 109 82 219 165
Nonvested restricted stock 0 1 1 1
Undistributed earnings 357 748 900 233
Weighted-average common shares outstanding 543 550 546 550
Earnings per common share:        
Distributed earnings $ 0.20 $ 0.15 $ 0.40 $ 0.30
Undistributed earnings $ 0.66 $ 1.35 $ 1.64 $ 0.42
Total earnings per common share $ 0.86 $ 1.50 $ 2.04 $ 0.72
Earnings per common share – assuming dilution:        
Net income attributable to Valero stockholders $ 466 $ 831 $ 1,120 $ 399
Weighted-average common shares outstanding 543 550 546 550
Common equivalent shares:        
Stock options 3 3 4 4
Performance awards and nonvested restricted stock 2 2 2 2
Weighted-average common shares outstanding – assuming dilution 548 555 552 556
Earnings per common share – assuming dilution $ 0.85 $ 1.50 $ 2.03 $ 0.72
Restricted Stock [Member]
        
Less dividends paid:        
Weighted-average common shares outstanding 3 3 3 3
Earnings per common share:        
Distributed earnings $ 0.20 $ 0.15 $ 0.40 $ 0.30
Undistributed earnings $ 0.66 $ 1.35 $ 1.64 $ 0.42
Total earnings per common share $ 0.86 $ 1.50 $ 2.04 $ 0.72
Earnings per common share – assuming dilution:        
Weighted-average common shares outstanding 3 3 3 3