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Debt, Bank Debt and Credit Facilities (Details) | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  | 0 Months Ended
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Mar. 31, 2013 USD ($) | Mar. 31, 2012 USD ($) | Mar. 31, 2013 U S Revolver [Member] USD ($) | Mar. 31, 2012 U S Revolver [Member] USD ($) | Dec. 31, 2012 U S Revolver [Member] USD ($) | Mar. 31, 2013 U S Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2012 U S Revolver Letter of Credit [Member] USD ($) | Mar. 31, 2013 Canadian Revolver [Member] CAD | Mar. 31, 2012 Canadian Revolver [Member] CAD | Mar. 31, 2013 Canadian Revolver [Member] USD ($) | Dec. 31, 2012 Canadian Revolver [Member] USD ($) | Mar. 31, 2013 Canadian Revolver Letter of Credit [Member] CAD | Dec. 31, 2012 Canadian Revolver Letter of Credit [Member] CAD | Mar. 31, 2013 Letter of Credit [Member] USD ($) | Dec. 31, 2012 Letter of Credit [Member] USD ($) | Mar. 31, 2013 Other Letter of Credit [Member] USD ($) | Dec. 31, 2012 Other Letter of Credit [Member] USD ($) | Mar. 31, 2013 Other Debt [Member] USD ($) | Mar. 31, 2012 Other Debt [Member] USD ($) | Mar. 31, 2013 Maximum [Member] U S Revolver [Member] | Mar. 31, 2013 Spinoff [Member] USD ($) | Apr. 16, 2013 Spinoff [Member] Subsequent Event [Member] USD ($) | Mar. 31, 2013 Spinoff [Member] Line of Credit [Member] USD ($) | Mar. 31, 2013 Spinoff [Member] Revolving Credit Facility [Member] USD ($) | May 01, 2013 Spinoff [Member] Notes Payable to Banks [Member] Subsequent Event [Member] USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 3,000,000,000 |  |  |  |  | 50,000,000 |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  | $ 800,000,000 |  | $ 500,000,000 | $ 300,000,000 |
Line of credit facility, expiration date (month, year) |  |  | December 2016 |  |  |  |  | November 2013 |  |  |  |  |  | June 2013 |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  | 0 |  | 0 | 59,000,000 | 59,000,000 |  |  | 0 | 0 | 10,000,000 | 10,000,000 | 550,000,000 | 418,000,000 | 441,000,000 | 275,000,000 |  |  |  | 0 |  |  |  |
Accounts Receivable Sales Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 250,000,000 |  |  |  |  |  |
Repayments | 0 | (150,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (150,000,000) |  |  |  |  |  |
Balance as of end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  |  |  |  |  |
Credit Facilities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capitalization ratios as per terms of revolver |  |  | 0.21 |  | 0.23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.60 |  |  |  |  |
Borrowings from long-term lines of credit |  |  | 0 | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term lines of credit |  |  | 0 | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum eligible trade receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |
Extended term of accounts receivable sales facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | July 2013 |  |  |  |  |  |  |

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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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4531-111522 Reference 2: 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=6361293&loc=d3e6676-107765 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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