Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Valero Energy Partners LP (Details) (USD $)	3 Months Ended		0 Months Ended
Valero Energy Partners LP (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 01, 2015	Dec. 31, 2014	Dec. 31, 2013
Valero Energy Partners LP Transactions (Textual)
Cash and temporary cash investments	$ 4,870,000,000	$ 3,647,000,000		$ 3,689,000,000	$ 4,292,000,000
Noncontrolling interests	568,000,000us-gaap_MinorityInterest			567,000,000us-gaap_MinorityInterest
Line of Credit [Member] \| VLP Revolver [Member]
Valero Energy Partners LP Transactions (Textual)
Cash consideration funded through borrowing by VLP under its revolving credit facility	200,000,000	0
Valero Energy Partners LP [Member] \| General Partner [Member]
Subsidiary, Sale of Stock [Line Items]
Limited partnership, ownership percentage by parent	2.00%			2.00%
Valero Energy Partners LP [Member] \| Limited Partner [Member]
Subsidiary, Sale of Stock [Line Items]
Limited partnership, ownership percentage by parent	69.60%			68.60%
Limited partnership, ownership percentage by noncontrolling owners	28.40%			29.40%
Valero Energy Partners LP [Member]
Valero Energy Partners LP Transactions (Textual)
Cash and temporary cash investments	28,000,000			237,000,000
Noncontrolling interests	377,000,000			375,000,000
Houston and St. Charles Terminal Services Business [Member] \| Valero Energy Partners LP [Member]
Valero Energy Partners LP Transactions (Textual)
Proceeds from the sale of property and equipment			571,000,000
Aggregate value of partnership interest received			100,000,000
Houston and St. Charles Terminal Services Business [Member] \| Valero Energy Partners LP [Member] \| Valero Energy Partners LP [Member]
Valero Energy Partners LP Transactions (Textual)
Cash consideration funded with VLP cash on hand			211,000,000
Houston and St. Charles Terminal Services Business [Member] \| Valero Energy Partners LP [Member] \| Valero Energy Partners LP [Member] \| Line of Credit [Member] \| VLP Revolver [Member]
Valero Energy Partners LP Transactions (Textual)
Cash consideration funded through borrowing by VLP under its revolving credit facility			200,000,000
Houston and St. Charles Terminal Services Business [Member] \| Valero Energy Partners LP [Member] \| Valero Energy Partners LP [Member] \| Subordinated Debt [Member]
Valero Energy Partners LP Transactions (Textual)
Cash consideration funded through borrowing by VLP under a subordinated credit agreement with Parent			$ 160,000,000
Houston and St. Charles Terminal Services Business [Member] \| General Partner [Member]
Valero Energy Partners LP Transactions (Textual)
Units received from sale of property and equipment			38,941
Houston and St. Charles Terminal Services Business [Member] \| Limited Partner [Member]
Valero Energy Partners LP Transactions (Textual)
Units received from sale of property and equipment			1,908,100