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POST-EMPLOYMENT BENEFITS - Composition of Plan Assets (Details) - Domestic defined benefit plans - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value of plan assets [line items]    
Equity securities $ 1,149 $ 1,134
Debt securities 810 742
Other - cash 6 14
Total fair value of plan assets $ 1,965 $ 1,890