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CONTINGENCIES (Details)
CAD in Millions, $ in Millions
 1 Months Ended 6 Months Ended
Jul. 26, 2010
mi
km
bbl
Jun. 30, 2015
USD ($)
a
item
Jun. 30, 2015
USD ($)
a
item
Jun. 30, 2015
CAD
item
Mar. 31, 2015
Jan. 02, 2015
Dec. 31, 2014
Apr. 30, 2011
USD ($)
CONTINGENCIES                
Aggregate limited amount for pollution liability under insurance program   $ 860.0 $ 860.0          
EEP                
CONTINGENCIES                
Ownership interest (as a percent)   35.90% 35.90% 35.90% 35.90% 36.60% 33.70%  
Line 6B Crude Oil Release                
CONTINGENCIES                
Estimated cost   $ 1,200.0 $ 1,200.0          
Estimated cost, net of tax | CAD       CAD 193        
Amount of to date insurance claim recorded   547.0 $ 547.0          
Amount of to date insurance claim recorded, net of tax | CAD       CAD 80        
Line 6B Crude Oil Release | EEP                
CONTINGENCIES                
Estimated volume of oil released (in barrels) | bbl 20,000              
Area affected by released crude oil 38              
Minimum acres of wetland provided through restoration | a     300          
Payment for mitigation of impacts on banks, bottomlands and watershed     $ 5.0          
Reimbursement payments to date   12.0 12.0          
Estimated fine or penalty amount   48.0 48.0          
Aggregate limited amount for pollution liability under insurance program               $ 650.0
Expected insurance recovery   $ 650.0 $ 650.0          
Number of actions or claims filed | item   5 5 5        
Minimum amount of civil penalties which may be assessed   $ 40.0 $ 40.0          
Line 6A Crude Oil Release                
CONTINGENCIES                
Number of actions or claims filed | item   1 1 1        
Environmental Liabilities                
CONTINGENCIES                
Estimated fine or penalty amount   $ 3.9 $ 3.9          
Amount of restoration land required | a   175