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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD
CAD in Millions
12 Months Ended
Nov. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
PROPERTY, PLANT AND EQUIPMENT        
Depreciation expense   CAD 2,900 CAD 2,000 CAD 1,900
Impairment loss   CAD 4,463 1,376 96
Northern Gateway Project        
PROPERTY, PLANT AND EQUIPMENT        
Impairment loss CAD 373      
Impairment loss, after-tax CAD 272      
Sandpiper Project        
PROPERTY, PLANT AND EQUIPMENT        
Impairment loss     992  
Impairment loss, after-tax     81  
EEP        
PROPERTY, PLANT AND EQUIPMENT        
Impairment charges       96
Land | Sandpiper Project        
PROPERTY, PLANT AND EQUIPMENT        
Estimated fair value     3  
Non-core trucking assets and related facilities | EEP        
PROPERTY, PLANT AND EQUIPMENT        
Impairment charges     CAD 11  
Berthold rail facility | EEP        
PROPERTY, PLANT AND EQUIPMENT        
Impairment charges       80
Louisiana propylene pipeline | EEP        
PROPERTY, PLANT AND EQUIPMENT        
Impairment charges       CAD 16