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LEASES - (Lessor) Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Jul. 17, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lessor, Lease, Description [Line Items]        
Fixed portion of the operating lease income   $ 180    
Operating lease income     $ 373 $ 251
Cost   92,807 92,337  
Accumulated Depreciation   27,318 25,834  
Cost for facilities accounted for as operating leases     2,007  
Accumulated depreciation for facilities accounted for as operating leases     $ 324  
Disposal group, disposed of by sale, not discontinued operations | Northern Courier pipeline        
Lessor, Lease, Description [Line Items]        
Ownership interest sold 85.00%      
Assets leased to others        
Lessor, Lease, Description [Line Items]        
Cost   834    
Accumulated Depreciation   $ 301    
Northern Courier pipeline | Liquids Pipelines        
Lessor, Lease, Description [Line Items]        
Ownership interest percentage 15.00% 15.00%