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FINANCE COSTS (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance Costs [Abstract]
Interest on borrowings	$ 780	$ 746
Interest on lease liabilities	70	61
Interest on post-employment benefits liability	13	11
Loss on repayment of long-term debt	0	19
Loss (gain) on foreign exchange	107	(79)
Change in fair value of derivative instruments	(97)	80
Capitalized interest	(19)	(19)
Other	27	21
Total finance costs	$ 881	$ 840

X

- Definition

The amount of costs associated with financing activities of the entity.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]]

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- Definition

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

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The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

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The amount of finance costs that the entity does not separately disclose in the same statement or note. [Refer: Finance costs]

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Finance Costs [Abstract]

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Interest Expense On Post-Employment Benefits Liability

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