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NET INCOME PER COMMON UNIT (Details 2) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Apr. 01, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Net income per common unit            
Net income attributable to controlling interests   $ 49,000,000 $ 31,000,000   $ 150,000,000 $ 125,000,000
Net income attributable to the General Partner   (1,000,000) (1,000,000)   (3,000,000) (3,000,000)
Incentive distributions attributable to the General Partner   (1,000,000)     (2,000,000)  
Class B units            
Net income per common unit            
Net income allocated to limited partners   2,000,000   $ 2,000,000 2,000,000  
Common units            
Net income per common unit            
Net income allocated to limited partners   $ 45,000,000 $ 30,000,000   $ 143,000,000 $ 122,000,000
Weighted average common units outstanding (millions) - basic (in units)   64.0 62.6   63.8 62.4
Weighted average common units outstanding (millions) - diluted (in units)   64.0 62.6   63.8 62.4
Net income per common unit - basic (in dollars per unit)   $ 0.70 $ 0.48   $ 2.23 $ 1.96
Net income per common unit - diluted (in dollars per unit)   $ 0.70 $ 0.48   $ 2.23 $ 1.96
GTN            
Distributions            
30% of GTN's distributable cash flow       $ 17,000,000    
GTN | Class B units | TransCanada | Distributions            
Distributions            
Portion of GTN's annual distributions to which the Class B units are entitled to receive a percentage share of the distributions above threshold (as a percent) 30.00%          
Percentage applied to GTN's distributable cash flow for the nine months ending December 31, 2015       30.00%    
Prorated threshold of GTN's distributions for payment to Class B units       $ 15,000,000