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POST-EMPLOYMENT BENEFITS - Benefit Plan Costs (Details) - Domestic defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost $ 76 $ 124
Net interest cost (18) (5)
Net pension expense 58 119
Administrative expense 4 4
Total pension cost recognized in net income 62 123
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net interest cost (134) (108)
Administrative expense 2 4
Accrued benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost 76 124
Net interest cost $ 116 $ 103