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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Variable Interest Entities (Details) $ in Millions	3 Months Ended
Variable Interest Entities (Details) $ in Millions	Mar. 31, 2016 USD ($) refineries	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Assets
Cash and temporary cash investments	$ 3,778	$ 4,114	$ 4,870	$ 3,689
Property, plant, and equipment, net	26,745	26,703
Liabilities
Current liabilities	6,775	6,994
Debt and capital lease obligations, less current portion	$ 7,207	7,208
Variable Interest Entity (Textual)
Number of refineries impacted by VLP operations \| refineries	9
Variable Interest Entity, Primary Beneficiary [Member]
Assets
Cash and temporary cash investments	$ 130	132
Other current assets	231	211
Property, plant, and equipment, net	1,247	1,243
Liabilities
Current liabilities	43	43
Debt and capital lease obligations, less current portion	175	175
Valero Energy Partners LP [Member]
Assets
Cash and temporary cash investments	102	81
Other current assets	0	0
Property, plant, and equipment, net	749	747
Liabilities
Current liabilities	10	13
Debt and capital lease obligations, less current portion	175	175
Diamond Green Diesel Holdings LLC [Member]
Assets
Cash and temporary cash investments	17	44
Other current assets	231	211
Property, plant, and equipment, net	357	356
Liabilities
Current liabilities	14	12
Debt and capital lease obligations, less current portion	$ 0	0
Variable Interest Entity (Textual)
Ownership percentage	50.00%
Maximum percentage of joint venture construction costs financed	60.00%
Other Variable Interest Entities [Member]
Assets
Cash and temporary cash investments	$ 11	7
Other current assets	0	0
Property, plant, and equipment, net	141	140
Liabilities
Current liabilities	19	18
Debt and capital lease obligations, less current portion	$ 0	$ 0
Variable Interest Entity (Textual)
Ownership percentage	50.00%
Limited Partner [Member] \| Valero Energy Partners LP [Member]
Variable Interest Entity (Textual)
Ownership percentage	65.70%
Limited Partner [Member] \| Valero Energy Partners LP - Public Unitholders [Member]
Variable Interest Entity (Textual)
Ownership percentage	32.30%
General Partner [Member] \| Valero Energy Partners LP [Member]
Variable Interest Entity (Textual)
Ownership percentage	2.00%