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LEASES (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Lessee, Lease, Description1 [Line Items]      
Variable lease payments $ 22    
Rent expense   $ 228  
Right-of-use assets securing lease liabilities 114    
Lease Liability Activity [Roll Forward]      
Lease liabilities, beginning of year 1,545    
Net additions 335    
Interest expense on lease liabilities 61    
Interest payments on lease liabilities (49)    
Principal payments of lease liabilities 167    
Lease liabilities, end of year 1,725 $ 1,545  
Current liability 230   $ 190
Long-term liability $ 1,495   $ 1,355
Minimum      
Lessee, Lease, Description1 [Line Items]      
Non-cancellable contract periods for leases, typical range 5 years    
Maximum      
Lessee, Lease, Description1 [Line Items]      
Non-cancellable contract periods for leases, typical range 15 years