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POST-EMPLOYMENT BENEFITS - Benefit Plan Costs (Details) - Domestic defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost $ 124 $ 156
Net interest cost (5) 11
Net pension expense 119 167
Administrative expense 4 4
Total pension cost recognized in net income 123 171
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net interest cost (108) (78)
Administrative expense 4 4
Accrued benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 124 156
Net interest cost $ 103 $ 89