Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings (loss) per common share:
Net income (loss) attributable to Valero stockholders	$ 1,263	$ (595)
Less: Income allocated to participating securities	4	1
Net income (loss) available to common stockholders	$ 1,259	$ (596)
Weighted-average common shares outstanding (in shares)	298	314
Earnings (loss) per common share (in dollars per share)	$ 4.22	$ (1.90)
Earnings (loss) per common share – assuming dilution:
Net income (loss) attributable to Valero stockholders	$ 1,263	$ (595)
Less: Income allocated to participating securities	4	1
Net income (loss) available to common stockholders	$ 1,259	$ (596)
Weighted-average common shares outstanding (in shares)	298	314
Effect of dilutive securities (in shares)	0	0
Weighted-average common shares outstanding – assuming dilution (in shares)	298	314
Earnings (loss) per common share – assuming dilution (in dollars per share)	$ 4.22	$ (1.90)