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Fair Value Measurements (Hybrid Notes) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Hybrid Instruments [Line Items]
Hybrid Notes as a hedge of the foreign currency exposure	$ 1,100	$ 1,700
Net investment in United States dollar denominated operations
Hybrid Instruments [Line Items]
Hybrid Notes as a hedge of the foreign currency exposure	1,200
After-tax foreign currency gain (loss)	$ 97	$ 5

X

- Definition

Fair value as of the balance sheet date of hybrid instruments.

+ References

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- Definition

Amount of the unrealized gain (loss) in earnings for the period from the increase (decrease) in fair value on hybrid instruments measured at fair value.

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