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POST-EMPLOYMENT BENEFITS - Composition of Plan Assets (Details) - Domestic defined benefit plans - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value of plan assets [line items]    
Equity securities $ 1,281 $ 1,879
Debt securities 1,474 1,302
Other - cash 15 17
Total fair value of plan assets $ 2,770 $ 3,198