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LEASES (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description1 [Line Items]    
Variable lease payments $ 20 $ 21
Right-of-use assets securing lease liabilities 400 338
Lease Liability Activity [Roll Forward]    
Lease liabilities, beginning of year 1,957 1,835
Net additions 383 386
Interest expense on lease liabilities 80 74
Interest payments on lease liabilities (76) (69)
Principal payments of lease liabilities (316) (269)
Lease liabilities, end of year 2,028 1,957
Current liability 362 336
Long-term liability $ 1,666 $ 1,621
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