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Valero Energy Partners LP (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Nov. 24, 2015 USD ($) $ / shares shares	Dec. 16, 2013 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) refineries	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Noncontrolling Interest Transactions (Textual)
Number of refineries impacted by VLP operations \| refineries			9
Net proceeds from issuance of Valero Energy Partners LP common units			$ 189	$ 0	$ 369
Cash and temporary cash investments			4,114	3,689	$ 4,292	$ 1,723
Noncontrolling interests			$ 827	$ 567
Valero Energy Partners LP [Member] \| General Partner [Member]
Ownership percentages of VLP
Noncontrolling interest, ownership percentage by parent			2.00%	2.00%
Valero Energy Partners LP [Member] \| Limited Partner [Member]
Ownership percentages of VLP
Noncontrolling interest, ownership percentage by parent			65.70%	68.60%
Noncontrolling interest, ownership percentage by public			32.30%	29.40%
Valero Energy Partners LP [Member]
Noncontrolling Interest Transactions (Textual)
Cash and temporary cash investments			$ 81	$ 237
Noncontrolling interests			$ 581	$ 375
Valero Energy Partners LP [Member] \| IPO [Member]
Noncontrolling Interest Transactions (Textual)
Units sold in the offering \| shares		17,250,000
Price per unit \| $ / shares		$ 23.00
Net proceeds from issuance of Valero Energy Partners LP common units		$ 369
Valero Energy Partners LP [Member] \| Public Offering [Member]
Noncontrolling Interest Transactions (Textual)
Units sold in the offering \| shares	4,250,000
Price per unit \| $ / shares	$ 46.25
Net proceeds from issuance of Valero Energy Partners LP common units	$ 189
Valero Energy Partners LP [Member] \| General Partner [Member]
Noncontrolling Interest Transactions (Textual)
Units sold in the offering \| shares	86,735
General partner contribution to maintain interest in VLP	$ 4