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NET INCOME PER COMMON UNIT (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Ownership interests in the Partnership    
Net income $ 67 $ 53 [1]
Net income attributed to GTN and Bison's former parent   (14)
Net income attributable to non-controlling interests (10) (10) [1]
Net income attributable to controlling interests 57 29 [1]
Net income allocated to General Partner 1 1 [1]
Net income allocable to common units 56 28 [1]
Weighted average common units outstanding (millions) - basic (in units) 62.3 53.5 [1]
Weighted average common units outstanding (millions) - diluted (in units) 62.3 53.5 [1]
Net income per common unit - basic (in dollars per unit) $ 0.90 $ 0.52 [1]
Net income per common unit - diluted (in dollars per unit) $ 0.90 $ 0.52 [1]
General Partner
   
Ownership interests in the Partnership    
Net income $ 1  
TC PipeLines GP, Inc. | General Partner
   
Ownership interests in the Partnership    
Additional percentage investment held by General Partner 2.00%  
[1] (a) Recast as discussed in Note 2.