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POST-EMPLOYMENT BENEFITS - Composition of Plan Assets (Details) - Domestic defined benefit plans - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value of plan assets [line items]    
Equity securities $ 1,472 $ 1,149
Debt securities 967 810
Other - cash 10 6
Total fair value of plan assets $ 2,449 $ 1,965