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SUBSEQUENT EVENTS (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended
Jul. 02, 2013
GTN
Former parent, TransCanada subsidiaries
Transaction between entities under common control
Mar. 31, 2014
Great Lakes
Mar. 31, 2014
Northern Border
Mar. 31, 2014
GTN
Mar. 31, 2014
Bison
Apr. 25, 2014
Subsequent event
Apr. 11, 2014
Subsequent event
GTN
Former parent, TransCanada subsidiaries
Transaction between entities under common control
Apr. 07, 2014
Subsequent event
GTN
May 01, 2014
Subsequent event
GTN
Expected
Apr. 07, 2014
Subsequent event
Bison
May 01, 2014
Subsequent event
Bison
Expected
Apr. 16, 2014
Subsequent event
Distribution declared
Northern Border
Apr. 07, 2014
Subsequent event
Distribution declared
Great Lakes
May 01, 2014
Subsequent event
Cash Distribution Paid
Northern Border
Expected
May 01, 2014
Subsequent event
Cash Distribution Paid
Great Lakes
Expected
Subsequent events                              
Cash distribution (in dollars per unit)           $ 0.81                  
Aggregate distribution declared and payable by investee               $ 36   $ 16          
Partnership interest (as a percent) 70.00%     70.00% 70.00%                    
Distribution received by Partnership                 25   11        
Partnership distribution                       52 29    
Ownership interest (as a percent)   46.45% 50.00%                        
Partnership's share of distributions declared and payable by investee                           26 13
Payment with respect to the Carty Lateral consideration             $ 25