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POST-EMPLOYMENT BENEFITS - Summary of Accrued Benefit Obligations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year $ 73  
Contributions by employees 34 $ 36
Net defined benefit plan (assets) accrued benefit obligations, ending balance 92 73
Domestic defined benefit plans    
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year 451  
Current service cost 146 121
Past service recovery 0 (21)
Pension expense, recognized in employee salaries and benefits expense (160) (112)
Net interest cost, recognized in finance costs 10 8
Remeasurements, recognized in other comprehensive income and equity 113 154
Net defined benefit plan (assets) accrued benefit obligations, ending balance 574 451
Domestic defined benefit plans | Accrued benefit obligation    
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year 2,900 2,330
Current service cost 146 121
Past service recovery 0 (21)
Net interest cost, recognized in finance costs 91 89
Benefits paid (82) (86)
Contributions by employees 34 36
Remeasurements, recognized in other comprehensive income and equity 276 431
Net defined benefit plan (assets) accrued benefit obligations, ending balance 3,365 2,900
Unfunded supplemental benefits for certain executives | Accrued benefit obligation    
Changes in net defined benefit liability (asset) [abstract]    
Accrued benefit obligations, beginning of year 73 67
Pension expense, recognized in employee salaries and benefits expense 13 2
Net interest cost, recognized in finance costs 3 3
Benefits paid (5) (4)
Remeasurements, recognized in other comprehensive income and equity 8 5
Net defined benefit plan (assets) accrued benefit obligations, ending balance $ 92 $ 73