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Valero Energy Partners LP (Details) (USD $) In Millions, except Share data, unless otherwise specified					0 Months Ended			0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Dec. 16, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member]	Mar. 31, 2014 Subsidiary Issuer [Member] Valero Energy Partners LP [Member]	Dec. 31, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member]	Dec. 16, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member] Offering [Member]	Mar. 31, 2014 Subsidiary Issuer [Member] Limited Partner [Member]	Dec. 31, 2013 Subsidiary Issuer [Member] Limited Partner [Member]	Mar. 31, 2014 Subsidiary Issuer [Member] General Partner [Member]	Dec. 31, 2013 Subsidiary Issuer [Member] General Partner [Member]
Noncontrolling Interest Transactions (Textual)
Common units sold in the Offering								17,250,000
Common unit price per unit								$ 23.00
Net proceeds from the Offering					$ 369
Noncontrolling interest, ownership percentage by parent									68.60%	68.60%	2.00%	2.00%
Noncontrolling interest, ownership percentage by public									29.40%	29.40%
Cash and temporary cash investments	3,647	4,292	1,857	1,723		384	375
Noncontrolling interests	$ 493	$ 486				$ 372	$ 370