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Separation of Retail Business (Details) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 14, 2013 | May. 01, 2013 | Apr. 30, 2013 | Apr. 16, 2013 | Jun. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Separation of Retail Business (Textual) |  |  |  |  |  |  |  |
Proceeds from short-term debt in anticipation of separation |  |  |  |  |  | $ 0 | $ 0 | $ 550,000,000
Cash distributed to Valero by CST Brands, Inc. |  |  |  |  |  | 0 | 0 | 500,000,000
Senior unsecured bonds of CST Brands, Inc. issued to us |  |  |  |  |  | 247,000,000 | 256,000,000 |
Cash held and retained by CST Brands, Inc. upon separation |  |  |  |  |  | 0 | 0 | 315,000,000
Gain on disposition of retained interest in CST Brands, Inc. |  |  |  |  |  | $ 0 | $ 0 | $ 325,000,000
Spinoff [Member] |  |  |  |  |  |  |  |
Separation of Retail Business (Textual) |  |  |  |  |  |  |  |
Spinoff transaction, ownership percentage by Valero stockholders |  | 80.00% |  |  |  |  |  |
Aggregate proceeds received related to separation of CST Brands, Inc |  | $ 1,050,000,000.00 |  |  |  |  |  |
Cash distributed to Valero by CST Brands, Inc. |  | 500,000,000 |  |  |  |  |  |
Senior unsecured bonds of CST Brands, Inc. issued to us |  | 550,000,000 |  |  |  |  |  |
Cash held and retained by CST Brands, Inc. upon separation |  |  | $ 315,000,000 |  |  |  |  |
Cost of separation in general and administrative expenses |  |  |  |  | $ 30,000,000 |  |  |
Retained ownership percentage disposed | 20.00% |  |  |  |  |  |  |
Gain on disposition of retained interest in CST Brands, Inc. | $ 325,000,000 |  |  |  |  |  |  |
Spinoff [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |
Separation of Retail Business (Textual) |  |  |  |  |  |  |  |
Proceeds from short-term debt in anticipation of separation |  |  |  | $ 550,000,000 |  |  |  |
CST Brands, Inc. securities exchanged in settlement of short-term borrowings | $ 467,000,000 | $ 550,000,000 |  |  |  |  |  |

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- Definition Reduction in cash due to no longer including the former subsidiary's cash in the consolidated entity's cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The profit or loss on sales of previously unissued stock by equity investees made to investors outside the consolidated group that is not reported as operating income. Represents the difference in the parent company's carrying amount of the equity interest in the subsidiary or equity investee immediately before and after the transaction. + References No definition available. + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4531-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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