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Debt, Bank Debt and Credit Facilities (Details) In Millions, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 U S Revolver [Member] USD ($) | Dec. 31, 2011 U S Revolver [Member] USD ($) | Dec. 31, 2010 U S Revolver [Member] USD ($) | Dec. 31, 2012 U S Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2011 U S Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2012 Canadian Revolver [Member] CAD | Dec. 31, 2011 Canadian Revolver [Member] CAD | Dec. 31, 2010 Canadian Revolver [Member] CAD | Nov. 30, 2012 Canadian Revolver [Member] CAD | Nov. 29, 2012 Canadian Revolver [Member] CAD | Dec. 31, 2012 Canadian Revolver Letter of Credit [Member] CAD | Dec. 31, 2011 Canadian Revolver Letter of Credit [Member] CAD | Dec. 31, 2012 Letter of Credit [Member] USD ($) | Dec. 31, 2011 Letter of Credit [Member] USD ($) | Dec. 31, 2012 Other Revolving Letter of Credit [Member] USD ($) | Dec. 31, 2011 Other Revolving Letter of Credit [Member] USD ($) | Dec. 31, 2012 Other Letter of Credit [Member] USD ($) | Dec. 31, 2011 Other Letter of Credit [Member] USD ($) | Dec. 31, 2012 Maximum [Member] U S Revolver [Member]
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 3,000 |  |  |  |  |  |  |  | 50 | 115 |  |  | $ 550 |  |  |  |  |  |
Line of credit facility, expiration date (month, year) |  |  |  | December 2016 |  |  |  |  | November 2013 |  |  |  |  |  |  | June 2013 |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  | 59 | 119 |  |  |  |  |  | 10 | 20 | 418 | 300 | 0 | 0 | 275 | 391 |
Credit Facilities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capitalization ratios as per terms of revolver |  |  |  | 0.23 | 0.29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.60
Borrowings from long-term lines of credit | 1,100 | 0 | 0 | 1,100 | 0 | 0 |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term lines of credit | $ 1,100 | $ 4 | $ 0 | $ 1,100 | $ 0 | $ 0 |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |

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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 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 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 4: 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=6943989&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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: 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=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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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- Definition Debt to capitalization ratios as per terms of revolver. + References No definition available. + Details
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- Definition Reflects when the credit facility terminates, which is presented in month, year. + References No definition available. + Details
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