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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Nov. 29, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT        
Depreciation expense   $ 2,900 $ 2,900 $ 2,000
Impairment loss   $ 1,104 $ 4,463 1,376
Northern Gateway Project        
PROPERTY, PLANT AND EQUIPMENT        
Impairment loss $ 373      
Impairment loss, after-tax $ 272      
Sandpiper Project        
PROPERTY, PLANT AND EQUIPMENT        
Impairment loss       992
Impairment loss, after-tax       81
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       $ 11