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Valero Energy Partners LP (Details) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |  |  | 0 Months Ended |  |  |  | 0 Months Ended |  |  |  |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 01, 2014 Valero Energy Partners LP [Member] Texas Crude Systems Business [Member] Subsequent Event [Member] | Jul. 01, 2014 Valero Energy Partners LP [Member] Texas Crude Systems Business [Member] Lease Agreements [Member] Subsequent Event [Member] | Jul. 01, 2014 Valero Energy Partners LP [Member] Texas Crude Systems Business [Member] Lease Agreements [Member] Subsequent Event [Member] renewal | Jun. 30, 2014 Subsidiary Issuer [Member] Valero Energy Partners LP [Member] | Dec. 31, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member] | Dec. 16, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member] Offering [Member] | Dec. 16, 2013 Subsidiary Issuer [Member] Valero Energy Partners LP [Member] Offering [Member] | Jun. 30, 2014 Subsidiary Issuer [Member] Limited Partner [Member] | Dec. 31, 2013 Subsidiary Issuer [Member] Limited Partner [Member] | Jun. 30, 2014 Subsidiary Issuer [Member] General Partner [Member] | Dec. 31, 2013 Subsidiary Issuer [Member] General Partner [Member]
Noncontrolling Interest Transactions (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units sold in the Offering |  |  |  |  |  |  |  |  |  | 17,250,000 |  |  |  |  |
Common unit price per unit |  |  |  |  |  |  |  |  |  |  | $ 23.00 |  |  |  |
Net proceeds from the Offering |  |  |  |  |  |  |  |  |  | $ 369 |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  | 68.60% | 68.60% | 2.00% | 2.00%
Noncontrolling interest, ownership percentage by public |  |  |  |  |  |  |  |  |  |  |  | 29.40% | 29.40% |  |
Cash and temporary cash investments | 3,480 | 2,398 | 4,292 | 1,723 |  |  |  | 382 | 375 |  |  |  |  |  |
Noncontrolling interests | 509 |  | 486 |  |  |  |  | 372 | 370 |  |  |  |  |  |
Proceeds from sale of Texas Crude Systems Business |  |  |  |  | 154 |  |  |  |  |  |  |  |  |  |
Initial agreement term |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Number of renewal options |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Duration of renewal option |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Decrease in VLP's cash and temporary cash investments | $ (812) | $ 675 |  |  | $ (154) |  |  |  |  |  |  |  |  |  |

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