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POST-EMPLOYMENT BENEFITS - Changes in Defined Benefit Liability (Asset) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in net defined benefit liability (asset) [abstract]    
Net defined benefit plan (assets) accrued benefit obligations, beginning balance $ 67  
Remeasurements, recognized in other comprehensive income and equity 355 $ (44)
Contributions by employees 36 39
Contributions by employer 179 148
Net defined benefit plan (assets) accrued benefit obligations, ending balance 73 67
Domestic defined benefit plans    
Changes in net defined benefit liability (asset) [abstract]    
Net defined benefit plan (assets) accrued benefit obligations, beginning balance 365  
Current service cost 121 143
Past service recovery (21) (43)
Pension expense, recognized in employee salaries and benefits expense (112) (116)
Interest (income) cost 8 12
Remeasurements, recognized in other comprehensive income and equity 277 (114)
Remeasurements, recognized in other comprehensive income and equity 154 (54)
Administrative expenses paid from plan assets (4) (4)
Net defined benefit plan (assets) accrued benefit obligations, ending balance 451 365
Domestic defined benefit plans | Plan assets    
Changes in net defined benefit liability (asset) [abstract]    
Net defined benefit plan (assets) accrued benefit obligations, beginning balance (1,965) (1,890)
Interest (income) cost (81) (73)
Remeasurements, recognized in other comprehensive income and equity 277 (114)
Contributions by employees 36 39
Contributions by employer 179 148
Benefits paid (86) (68)
Administrative expenses paid from plan assets (3) (3)
Net defined benefit plan (assets) accrued benefit obligations, ending balance (2,449) (1,965)
Domestic defined benefit plans | Accrued benefit obligation    
Changes in net defined benefit liability (asset) [abstract]    
Net defined benefit plan (assets) accrued benefit obligations, beginning balance 2,330 2,342
Current service cost 121 143
Past service recovery (21) (43)
Interest (income) cost 89 85
Contributions by employees 36 39
Benefits paid (86) (68)
Remeasurements, recognized in other comprehensive income and equity 431 (168)
Net defined benefit plan (assets) accrued benefit obligations, ending balance 2,900 2,330
Unfunded supplemental benefits for certain executives | Accrued benefit obligation    
Changes in net defined benefit liability (asset) [abstract]    
Net defined benefit plan (assets) accrued benefit obligations, beginning balance 67 66
Pension expense, recognized in employee salaries and benefits expense 2 2
Interest (income) cost 3 2
Benefits paid (4) (4)
Remeasurements, recognized in other comprehensive income and equity 5 1
Net defined benefit plan (assets) accrued benefit obligations, ending balance $ 73 $ 67