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Income Taxes - Summary of Reconciliation of Income Tax Expense (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Income before income taxes	$ 8,125	$ 6,770
Income tax expense at Canadian statutory tax rate	2,153	1,794
Increase (decrease) in income taxes due to:
Tax-exempt investment income	(261)	(171)
Differences in tax rate on income not subject to tax in Canada	(917)	(528)
Adjustments to taxes related to prior years	(47)	(96)
Tax losses and temporary differences not recognized as deferred taxes	53
Tax rate change	(19)	27
Other differences	251	169
Income tax expense	$ 1,213	$ 1,195

X

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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