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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ 12,198 $ 11,780 $ 11,143
Property, plant and equipment, weighted average capitalised interest rate 3.90% 3.90%  
Disposals, property, plant and equipment $ 38 $ 9  
Proceeds on disposition 38 25  
Gain on disposition of property, plant and equipment 0 16  
Adjustment to cost and accumulated depreciation 1,159 943  
Construction in progress (not yet in service)      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment $ 1,320 $ 1,339