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Insurance Contract Liabilities and Reinsurance Assets - Summary of Change in Insurance Contract Liabilities (Parenthetical) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in liabilities under insurance contracts and reinsurance contracts issued [abstract]    
Change in gross insurance contract liabilities $ 11,125 $ 39,391
Change in insurance contract liabilities 10,719 36,982
Increase in insurance contract liabilities 9,868 37,876
Contract liabilities in gross claims and benefits $ 1,257 $ 1,515