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ORGANIZATION (Details)
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
North Baja Pipeline, LLC
mi
Dec. 31, 2012
Tuscarora Gas Transmission Company
mi
Dec. 31, 2012
Great Lakes
mi
Feb. 28, 2007
Great Lakes
Dec. 31, 2012
Northern Border
mi
Dec. 31, 2012
GTN
mi
May 03, 2011
GTN
Dec. 31, 2012
Bison
mi
May 03, 2011
Bison
Organization                  
Ownership interest (as a percent)     46.45% 46.45% 50.00% 25.00% 25.00% 25.00% 25.00%
Partnership interest held (as a percent) 100.00% 100.00%              
Length of the pipeline owned by equity method investee (in miles) 86 305 2,115   1,408 1,353   303