Price Risk Management Activities, Effect of Derivative Instruments on Income and Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Commodity Contracts [Member]
Effect of Derivative Instruments on Income
Gain recognized in other comprehensive income (loss)	$ 3	$ 30	$ 82
Commodity Contracts [Member] \| Revenues [Member]
Effect of Derivative Instruments on Income
Gain (loss) reclassified from accumulated other comprehensive loss into income	(21)	117	(8)
Commodity Contracts [Member] \| Revenues [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	(10)	(18)	(27)
Commodity Contracts [Member] \| Cost of Materials and Other [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	(19)	(86)	208
Commodity Contracts [Member] \| Operating Expenses (Excluding Depreciation and Amortization Expense) [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	0	0	1
Foreign Currency Contracts [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	$ (12)	$ 36	$ (34)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of materials and other	Cost of materials and other	Cost of materials and other

VALERO ENERGY CORP/TX 10-K