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GENERAL BUSINESS DESCRIPTION (Details) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
General business description |  |
Number of operating segments | 5 |
EEP |  |
GENERAL BUSINESS DESCRIPTION |  |
Ownership interest (as a percent) | 21.80% |
Sponsored Investments | Alliance Pipeline Canada joint venture |  |
GENERAL BUSINESS DESCRIPTION |  |
Interest (as a percent) | 50.00% |
Sponsored Investments | The fund |  |
GENERAL BUSINESS DESCRIPTION |  |
Economic interest (as a percent) | 67.70% | 69.20%
Sponsored Investments | United States segment of the Alberta Clipper Project |  |
GENERAL BUSINESS DESCRIPTION |  |
Percentage of investment | 66.70% | 66.70%
Sponsored Investments | EEP |  |
GENERAL BUSINESS DESCRIPTION |  |
Ownership interest (as a percent) | 21.80% | 23.00%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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