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Valero Energy Partners LP (Details)		6 Months Ended
Valero Energy Partners LP (Details)	Mar. 01, 2015 USD ($) shares	Jun. 30, 2015 USD ($) refineries	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)
Valero Energy Partners LP Transactions (Textual)
Number of refineries impacted by VLP operations \| refineries		7
Cash and temporary cash investments		$ 5,764,000,000	$ 3,689,000,000	$ 3,480,000,000	$ 4,292,000,000
Noncontrolling interests		553,000,000	$ 567,000,000
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
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		$ 52,000,000	$ 237,000,000
Noncontrolling interests		$ 381,000,000	$ 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 \| shares	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 \| shares	1,908,100