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ORGANIZATION (Details)
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Northern Border
Dec. 31, 2013
Great Lakes
Feb. 28, 2007
Great Lakes
Dec. 31, 2013
GTN
mi
Dec. 31, 2013
GTN
TransCanada
Dec. 31, 2013
Northern Border
mi
Dec. 31, 2013
Northern Border
ONEOK Partners, L.P.
Dec. 31, 2013
Bison
mi
Dec. 31, 2013
Bison
TransCanada
Dec. 31, 2013
Great Lakes
mi
Dec. 31, 2013
Great Lakes
TransCanada
Dec. 31, 2013
North Baja Pipeline, LLC
mi
Dec. 31, 2013
Tuscarora Gas Transmission Company
mi
Organization                          
Length of pipeline owned (in miles)       1,353   1,408   303   2,115   86 305
Remaining noncontrolling ownership interest (as a percent)         30.00%       30.00%        
Partnership interest held (as a percent)       70.00%       70.00%       100.00% 100.00%
Remaining ownership interest (as a percent)             50.00%       53.55%    
Ownership interest (as a percent) 50.00% 46.45% 46.45%