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ORGANIZATION (Details 2)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
General Partner
Dec. 31, 2011
General Partner
Dec. 31, 2012
TransCanada Corporation
Common units and interest in the partnership            
General partner ownership interest in the partnership (as a percent)       2.00%    
Number of common units owned 53,500,000 53,500,000 46,200,000 5,797,106   11,287,725
Limited partner interest (as a percent)           20.70%
Aggregate ownership interest in the Partnership (as a percent)       12.60% 12.60% 33.30%