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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, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Net deferred pension asset $ (83) $ (96)
Domestic defined benefit plans    
Disclosure of defined benefit plans [line items]    
Plan assets, at fair value 2,770 3,198
Accrued benefit obligations (2,430) (3,171)
Surplus of plan assets over accrued benefit obligations 340 27
Effect of asset ceiling limit (42) (9)
Net deferred pension asset 298 18
Deferred pension asset 298 21
Deferred pension liability $ 0 $ (3)