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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Fair Value Derivatives (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Foreign Currency Fair Value Hedge Derivative [Line Items]
Realized loss on derivative	$ 130	$ (1,106)
Fair Value Hedges
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized gain/(loss) on derivative	(3)	218
Unrealized loss on hedged item	(4)	(203)
Fair Value Hedges | Interest rate contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Realized loss on derivative	(39)	(12)
Realized gain on hedged item	$ 45	$ 0

X

- Definition

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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