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Valero Energy Partners LP (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 01, 2014	Dec. 16, 2013	Dec. 31, 2011
Noncontrolling Interest Transactions Textual [Abstract]
Net proceeds from initial public offering of common units of Valero Energy Partners LP	$ 0	$ 369	$ 0
Cash and temporary cash investments	3,689	4,292	1,723			1,024
Noncontrolling interests	567us-gaap_MinorityInterest	486us-gaap_MinorityInterest
Valero Energy Partners LP [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Cash and temporary cash investments	237	375
Noncontrolling interests	375	370
Valero Energy Partners LP [Member] \| Texas Crude Systems Business [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Proceeds from sale of property, plant, and equipment				154
Limited Partner [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Noncontrolling interest, ownership percentage by parent	68.60%	68.60%
Noncontrolling interest, ownership percentage by public	29.40%	29.40%
General Partner [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Noncontrolling interest, ownership percentage by parent	2.00%	2.00%
Offering [Member] \| Valero Energy Partners LP [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Common units sold in the Offering					17,250,000
Common unit price per unit					$ 23.00
Net proceeds from initial public offering of common units of Valero Energy Partners LP					$ 369