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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
Nov. 02, 2015
Oct. 23, 2015
Oct. 22, 2015
Oct. 09, 2015
Sep. 30, 2015
Mar. 31, 2015
Northern Border            
Distributions            
Ownership interest (as a percent)         50.00%  
Great Lakes            
Distributions            
Ownership interest (as a percent)         46.45% 46.45%
Subsequent event | Northern Border | Revolving credit facility | Credit Facility renewal and extension maturing October 9, 2020            
Distributions            
Maximum borrowing capacity       $ 200    
Term of the facility       5 years    
Subsequent event | Distribution declared | Northern Border            
Distributions            
Partnership distribution   $ 45        
Subsequent event | Distribution declared | Great Lakes            
Distributions            
Partnership distribution   $ 7        
Subsequent event | Cash Distribution Paid | Northern Border            
Distributions            
Partnership's share of distributions $ 23          
Subsequent event | Cash Distribution Paid | Great Lakes            
Distributions            
Partnership's share of distributions $ 3          
Subsequent event | Common units            
Distributions            
Cash distribution (in dollars per unit)     $ 0.89