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POST-EMPLOYMENT BENEFITS - Benefit Plan Costs (Details) - Domestic defined benefit plans - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]    
Current service cost $ 143 $ 137
Past service recovery (43) 0
Net interest cost 12 9
Net pension expense 112 146
Administrative expense 4 4
Total pension cost recognized in net income 116 150
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net interest cost (73) (72)
Administrative expense 3 4
Accrued benefit obligation    
Disclosure of net defined benefit liability (asset) [line items]    
Past service recovery (43)  
Net interest cost $ 85 $ 81