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Separation of Retail Business (Details) (USD $) | 9 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | May 01, 2013 Spinoff [Member] | Apr. 30, 2013 Spinoff [Member] | Nov. 30, 2013 Spinoff [Member] | Jun. 30, 2013 Spinoff [Member] | May 01, 2013 Spinoff [Member] | May 01, 2013 Spinoff [Member] Notes Payable to Banks [Member] | Apr. 16, 2013 Spinoff [Member] Notes Payable to Banks [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 |  |
Proceeds from short-term debt in anticipation of separation | 0 | 550,000,000 |  |  |  |  |  |  | 550,000,000
Cash distributed to Valero by CST Brands, Inc. | 0 | 500,000,000 | 500,000,000 |  |  |  |  |  |
Senior unsecured bonds of CST Brands, Inc. issued to us |  |  |  |  |  |  | 550,000,000 |  |
CST Brands, Inc. securities exchanged in settlement of short-term borrowings |  |  |  |  |  |  |  | 550,000,000 |
Cash held and retained by CST Brands, Inc. upon separation | 0 | 315,000,000 |  | 315,000,000 |  |  |  |  |
Cost of separation in general and administrative expense |  |  |  |  |  | $ 30,000,000 |  |  |
Retained ownership percentage disposed |  |  |  |  | 20.00% |  |  |  |

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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=31042434&loc=d3e3213-108585 + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: 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 4: 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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