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PARTNERS' EQUITY (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
May 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Limited Partners
Dec. 31, 2011
Limited Partners
May 31, 2011
General Partner
Dec. 31, 2012
General Partner
Dec. 31, 2011
General Partner
Dec. 31, 2012
TransCanada Corporation
Public offering                    
Number of common units sold in public offering 7,245,000                  
Price per common unit in public offering $ 47.58                  
Gross proceeds from public offering of common units $ 345                  
Net proceeds from public offering of common units 331                  
Common units and interest in the partnership                    
Capital contribution by general partner             $ 7      
Aggregate ownership interest in the Partnership (as a percent)         98.00%     12.60% 12.60% 33.30%
Number of common units owned   53,500,000 53,500,000 46,200,000 53,472,766 53,472,766   5,797,106   11,287,725
General partner ownership interest in the partnership (as a percent)               2.00%