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LEASES (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Lessee, Lease, Description1 [Line Items]    
Variable lease payments $ 21 $ 23
Right-of-use assets securing lease liabilities 338 240
Lease Liability Activity [Roll Forward]    
Lease liabilities, beginning of year 1,835 1,725
Net additions 386 320
Interest expense on lease liabilities 74 70
Interest payments on lease liabilities (69) (67)
Principal payments of lease liabilities (269) (213)
Lease liabilities, end of year 1,957 1,835
Current liability 336 278
Long-term liability $ 1,621 $ 1,557
Minimum    
Lessee, Lease, Description1 [Line Items]    
Non-cancellable contract periods for leases, typical range (in years) 5 years  
Maximum    
Lessee, Lease, Description1 [Line Items]    
Non-cancellable contract periods for leases, typical range (in years) 15 years