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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, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Net deferred pension liability $ (92) $ (73)
Domestic defined benefit plans    
Disclosure of defined benefit plans [line items]    
Plan assets, at fair value 2,791 2,449
Accrued benefit obligations (3,365) (2,900)
Deferred pension asset 16 14
Deferred pension liability (590) (465)
Net deferred pension liability $ (574) $ (451)