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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, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Net deferred pension liability $ (73) $ (67)
Domestic defined benefit plans    
Disclosure of defined benefit plans [line items]    
Plan assets, at fair value 2,449 1,965
Accrued benefit obligations (2,900) (2,330)
Deferred pension asset 14 8
Deferred pension liability (465) (373)
Net deferred pension liability $ (451) $ (365)