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POST-EMPLOYMENT BENEFITS - Summary of Accrued Benefit Obligations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year $ 96  
Contributions by employees 31 $ 32
Net defined benefit plan (assets) accrued benefit obligations, ending balance 83 96
Domestic defined benefit plans    
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year (18)  
Current service cost 124 156
Pension expense, recognized in employee salaries and benefits expense (123) (171)
Net interest cost, recognized in finance costs (5) 11
Remeasurements, recognized in other comprehensive income and equity (269) (586)
Net defined benefit plan (assets) accrued benefit obligations, ending balance (298) (18)
Domestic defined benefit plans | Accrued benefit obligation    
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year 3,171 3,365
Current service cost 124 156
Net interest cost, recognized in finance costs 103 89
Benefits paid (93) (99)
Contributions by employees 31 32
Remeasurements, recognized in other comprehensive income and equity (906) (372)
Net defined benefit plan (assets) accrued benefit obligations, ending balance 2,430 3,171
Unfunded supplemental benefits for certain executives | Accrued benefit obligation    
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year 96 92
Pension expense, recognized in employee salaries and benefits expense 13 12
Net interest cost, recognized in finance costs 4 3
Benefits paid (6) (4)
Remeasurements, recognized in other comprehensive income and equity (24) (7)
Net defined benefit plan (assets) accrued benefit obligations, ending balance $ 83 $ 96