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POST-EMPLOYMENT BENEFITS - Present Value of Accrued Plan Benefits and Estimated Market Values of Net Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]    
Net deferred pension liability $ (67) $ (66)
Domestic defined benefit plans    
Disclosure of defined benefit plans [line items]    
Plan assets, at fair value 1,965 1,890
Accrued benefit obligations (2,330) (2,342)
Deferred pension asset 8 8
Deferred pension liability (373) (460)
Net deferred pension liability $ (365) $ (452)