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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Variable Interest Entities (Details) $ in Millions	6 Months Ended
Variable Interest Entities (Details) $ in Millions	Jun. 30, 2016 USD ($) refineries	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Assets
Cash and temporary cash investments	$ 4,925	$ 4,114	$ 5,764	$ 3,689
Property, plant, and equipment, net	26,589	26,703
Liabilities
Current liabilities	8,652	6,994
Debt and capital lease obligations, less current portion	$ 6,646	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	$ 168	132
Other current assets	87	211
Property, plant, and equipment, net	1,296	1,243
Liabilities
Current liabilities	33	43
Debt and capital lease obligations, less current portion	364	175
Valero Energy Partners LP [Member]
Assets
Cash and temporary cash investments	67	81
Other current assets	1	0
Property, plant, and equipment, net	801	747
Liabilities
Current liabilities	10	13
Debt and capital lease obligations, less current portion	$ 314	175
Valero Energy Partners LP [Member] \| Limited Partner [Member]
Variable Interest Entity (Textual)
Ownership percentage	66.10%
Valero Energy Partners LP [Member] \| General Partner [Member]
Variable Interest Entity (Textual)
Ownership percentage	2.00%
Diamond Green Diesel Holdings LLC [Member]
Assets
Cash and temporary cash investments	$ 83	44
Other current assets	86	211
Property, plant, and equipment, net	356	356
Liabilities
Current liabilities	16	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	$ 18	7
Other current assets	0	0
Property, plant, and equipment, net	139	140
Liabilities
Current liabilities	7	18
Debt and capital lease obligations, less current portion	$ 50	$ 0
Variable Interest Entity (Textual)
Ownership percentage	50.00%
Valero Energy Partners LP - Public Unitholders [Member] \| Limited Partner [Member]
Variable Interest Entity (Textual)
Ownership percentage	31.90%