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Earnings Per Common Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Less dividends paid:    
Common stock $ 111 $ 83
Weighted-average common shares outstanding 550 551
Earnings per common share:    
Distributed earnings $ 0.20 $ 0.15
Earnings per common share – assuming dilution:    
Weighted-average common shares outstanding 550 551
Common equivalent shares:    
Weighted-average common shares outstanding – assuming dilution 556 551
Common Stock [Member]
    
Earnings per common share:    
Net income (loss) attributable to Valero stockholders 654 (432)
Less dividends paid:    
Common stock 110 83
Nonvested restricted stock 1 0
Undistributed earnings (loss) 543 (515)
Weighted-average common shares outstanding 550 551
Earnings per common share:    
Distributed earnings $ 0.20 $ 0.15
Undistributed earnings (loss) $ 0.98 $ (0.93)
Total earnings per common share $ 1.18 $ (0.78)
Earnings per common share – assuming dilution:    
Net income (loss) attributable to Valero stockholders $ 654 $ (432)
Weighted-average common shares outstanding 550 551
Common equivalent shares:    
Stock options 4 0
Performance awards and nonvested restricted stock 2 0
Weighted-average common shares outstanding – assuming dilution 556 551
Earnings per common share – assuming dilution $ 1.18 $ (0.78)
Restricted Stock [Member]
    
Less dividends paid:    
Weighted-average common shares outstanding 3 3
Earnings per common share:    
Distributed earnings $ 0.20 $ 0.15
Undistributed earnings (loss) $ 0.98 $ 0.00
Total earnings per common share $ 1.18 $ 0.15
Earnings per common share – assuming dilution:    
Weighted-average common shares outstanding 3 3