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LEASES (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description1 [Line Items]    
Variable lease payments $ 23 $ 22
Right-of-use assets securing lease liabilities 240 114
Lease Liability Activity [Roll Forward]    
Lease liabilities, beginning of year 1,725 1,545
Net additions 320 335
Interest expense on lease liabilities 70 61
Interest payments on lease liabilities (67) (49)
Principal payments of lease liabilities (213) (167)
Lease liabilities, end of year 1,835 1,725
Current liability 278 230
Long-term liability $ 1,557 $ 1,495
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