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POST-EMPLOYMENT BENEFITS - Composition of Plan Assets (Details) - Domestic defined benefit plans - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of plan assets [line items]
Equity securities	$ 1,689	$ 1,472
Debt securities	1,087	967
Other - cash	15	10
Total fair value of plan assets	$ 2,791	$ 2,449

X

- Definition

The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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- Definition

The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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