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Debt, Bank Debt and Credit Facilities (Details) | 3 Months Ended |  | 3 Months Ended |  |  |  | 3 Months Ended |  |  |  |  |  | 0 Months Ended | 1 Months Ended |
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Mar. 31, 2012 USD ($) | Mar. 31, 2011 USD ($) | Dec. 31, 2011 USD ($) | Mar. 31, 2012 U S Revolver [Member] USD ($) | Mar. 31, 2011 U S Revolver [Member] USD ($) | Dec. 31, 2011 U S Revolver [Member] USD ($) | Mar. 31, 2012 U S Revolver Letter of Credit [Member] USD ($) | Dec. 31, 2011 U S Revolver Letter of Credit [Member] USD ($) | Mar. 31, 2012 Canadian Revolver [Member] CAD | Mar. 31, 2011 Canadian Revolver [Member] CAD | Dec. 31, 2011 Canadian Revolver [Member] CAD | Mar. 31, 2012 Canadian Revolver Letter of Credit [Member] CAD | Dec. 31, 2011 Canadian Revolver Letter of Credit [Member] CAD | Mar. 31, 2012 Other Letter of Credit [Member] USD ($) | Dec. 31, 2011 Other Letter of Credit [Member] USD ($) | May 04, 2012 Other Debt [Member] USD ($) | Apr. 30, 2012 Other Debt [Member] USD ($) | Mar. 31, 2012 Maximum [Member] U S Revolver [Member]
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 500,000,000 |  |  | $ 3,000,000,000 |  |  |  |  | 115,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date | June 2012 |  |  | December 2016 |  |  |  |  | December 2012 |  |  |  |  |  |  |  |  |
Letters of credit outstanding | 500,000,000 |  | 300,000,000 | 0 |  | 0 | 153,000,000 | 119,000,000 | 0 |  | 0 | 20,000,000 | 20,000,000 | 456,000,000 | 391,000,000 |  |  |
Accounts Receivable Sales Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of period | 250,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of receivables | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 850,000,000 |
Repayments | (150,000,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | (500,000,000) |  |
Balance as of end of period | 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facilities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capitalization ratios as per terms of revolver |  |  |  | 0.27 |  | 0.29 |  |  |  |  |  |  |  |  |  |  |  | 0.60
Borrowings from long-term lines of credit |  |  |  | 0 | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Repayments of long-term lines of credit |  |  |  | 0 | 0 |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Accounts Receivable Sales Facility (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum eligible trade receivables | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extended term of accounts receivable sales facility | June 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: 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 3: 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 4: 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 inflow from 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 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: 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 3: 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 4: 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 Debt to capitalization ratios as per terms of revolver. + References No definition available. + Details
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