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Debt, Bank Debt and Credit Facilities (Details) | 6 Months Ended |  |  | 0 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |  |  |  |  |  |
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Jun. 30, 2013 USD ($) | Jun. 30, 2012 USD ($) | Jun. 30, 2013 A/R Sales Facility [Member] USD ($) | Jun. 30, 2012 A/R Sales Facility [Member] USD ($) | May 01, 2013 Spinoff [Member] USD ($) | Mar. 20, 2013 Spinoff [Member] USD ($) | May 01, 2013 Spinoff [Member] Notes Payable to Banks [Member] USD ($) | Apr. 16, 2013 Spinoff [Member] Sourced From Parent's Short-Term Borrowings [Member] Notes Payable to Banks [Member] USD ($) | Mar. 20, 2013 Revolving Credit Facility [Member] Spinoff [Member] USD ($) | Jun. 30, 2013 Letter of Credit [Member] USD ($) | Dec. 31, 2012 Letter of Credit [Member] USD ($) | Jun. 30, 2013 U S Revolver [Member] USD ($) | Jun. 30, 2012 U S Revolver [Member] USD ($) | Dec. 31, 2012 U S Revolver [Member] USD ($) | Jun. 30, 2013 U S Revolver [Member] Maximum [Member] | Jun. 30, 2013 U S Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2012 U S Revolver Letter of Credit [Member] USD ($) | Jun. 30, 2013 Canadian Revolver [Member] CAD | Jun. 30, 2012 Canadian Revolver [Member] CAD | Dec. 31, 2012 Canadian Revolver [Member] CAD | Jun. 30, 2013 Canadian Revolver Letter of Credit [Member] CAD | Dec. 31, 2012 Canadian Revolver Letter of Credit [Member] CAD | Mar. 20, 2013 Line of Credit [Member] Spinoff [Member] USD ($) | Jun. 30, 2013 Other Letter of Credit [Member] USD ($) | Dec. 31, 2012 Other Letter of Credit [Member] USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 1,500,000,000 |  |  | $ 800,000,000 |  |  | $ 300,000,000 | $ 550,000,000 |  | $ 3,000,000,000 |  |  |  |  |  | 50,000,000 |  |  |  |  | $ 500,000,000 |  |
Line of credit facility, expiration date (month, year) |  |  |  |  |  |  |  |  |  | June 2014 |  | December 2016 |  |  |  |  |  | November 2013 |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  | 250,000,000 | 418,000,000 | 0 |  | 0 |  | 59,000,000 | 59,000,000 | 0 |  | 0 | 9,000,000 | 10,000,000 |  | 87,000,000 | 275,000,000
Accounts Receivable Sales Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  | 100,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of receivables | 0 | 1,300,000,000 | 0 | 1,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments | 0 | (1,450,000,000) | 0 | (1,450,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of end of period |  |  | 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facilities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capitalization ratios as per terms of revolver |  |  |  |  |  |  |  |  |  |  |  | 0.19 |  | 0.23 | 0.60 |  |  |  |  |  |  |  |  |  |
Borrowings from long-term lines of credit | 0 | 1,100,000,000 |  |  |  |  |  |  |  |  |  | 0 | 1,100,000,000 |  |  |  |  | 0 | 0 |  |  |  |  |  |
Repayments of long-term lines of credit | 0 | 1,100,000,000 |  |  |  |  |  |  |  |  |  | 0 | 1,100,000,000 |  |  |  |  | 0 | 0 |  |  |  |  |  |
Proceeds from short-term debt | 550,000,000 | 0 |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured bonds of CST issued to us |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CST bonds exchanged in settlement of short-term borrowings |  |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Sales Facility (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of accounts receivable sales facility |  |  | July 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + 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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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Value of investments transferred from the entity's investments in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Debt to capitalization ratios as per terms of revolver. + References No definition available. + Details
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