Valero Energy Partners LP (Details) (USD $) In Millions, except Share data, unless otherwise specified					0 Months Ended					0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Jul. 01, 2014 Valero Energy Partners LP [Member] Texas Crude Systems Business [Member]	Jul. 01, 2014 Valero Energy Partners LP [Member] Texas Crude Systems Business [Member] Lease Agreements [Member]	Jul. 01, 2014 Valero Energy Partners LP [Member] Texas Crude Systems Business [Member] Lease Agreements [Member] renewal	Sep. 30, 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]	Dec. 16, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member] Offering [Member]	Sep. 30, 2014 Subsidiary Issuer [Member] Limited Partner [Member]	Dec. 31, 2013 Subsidiary Issuer [Member] Limited Partner [Member]	Sep. 30, 2014 Subsidiary Issuer [Member] General Partner [Member]	Dec. 31, 2013 Subsidiary Issuer [Member] General Partner [Member]
Valero Energy Partners LP 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	4,191	4,292	1,908	1,723				231	375
Noncontrolling interests	508	486						374	370
Initial agreement term						10 years
Number of renewal options							1
Duration of renewal option						5 years
Proceeds from sale of Texas Crude Systems Business					$ 154