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Financial Instruments - Inception Gains And Losses (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss [abstract]
Unamortized net gain at beginning of year	$ 9	$ 49	$ 105
New inception gains (losses)(1)	(13)	3	(14)
Change in foreign exchange rates	0	0	5
Amortization recorded in net earnings during the year	(29)	(43)	(47)
Unamortized net gain (loss) at end of year(2)	$ (33)	$ 9	$ 49

X

- Definition

The aggregate difference between the fair value at initial recognition and the transaction price for financial instruments that is yet to be recognised in profit or loss. [Refer: Financial instruments, class [member]]

+ References

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The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss]

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- Definition

The increase (decrease) in financial assets resulting from foreign exchange. [Refer: Financial assets]

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The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss resulting from new transactions. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss; Financial instruments, class [member]]

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