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POST-EMPLOYMENT BENEFITS - Changes in Defined Benefit Liability (Asset) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance $ 66  
Remeasurements, recognized in other comprehensive income and equity (44) $ 160
Net defined benefit liability (asset), ending balance 67 66
Domestic defined benefit plans    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 452  
Current service cost 143 137
Past service recovery (43) 0
Interest cost (income) (12) (9)
Pension expense, recognized in employee salaries and benefits expense (116) (150)
Remeasurements, recognized in other comprehensive income and equity (114) 92
Remeasurements, recognized in other comprehensive income and equity (54) 60
Administrative expenses paid from plan assets (4) (4)
Net defined benefit liability (asset), ending balance 365 452
Domestic defined benefit plans | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance (1,890) (1,619)
Interest cost (income) 73 72
Remeasurements, recognized in other comprehensive income and equity (114) 92
Contributions by employees, (decrease) increase 39 42
Contributions by employer, (decrease) increase 148 145
Benefits paid, decrease (increase) (68) (76)
Administrative expenses paid from plan assets (3) (4)
Net defined benefit liability (asset), ending balance (1,965) (1,890)
Domestic defined benefit plans | Accrued benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 2,342 2,006
Past service recovery (43)  
Interest cost (income) (85) (81)
Remeasurements, recognized in other comprehensive income and equity (168) 152
Net defined benefit liability (asset), ending balance 2,330 2,342
Unfunded supplemental benefits for certain executives | Accrued benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset), beginning balance 66 62
Interest cost (income) (2) (3)
Pension expense, recognized in employee salaries and benefits expense 2 2
Benefits paid, decrease (increase) (4) (3)
Remeasurements, recognized in other comprehensive income and equity 1 2
Net defined benefit liability (asset), ending balance $ 67 $ 66