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Risk Management - Summary of Effect of Conditional Master Netting and Similar Arrangements (Parenthetical) (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of offsetting of financial assets [abstract]    
Accrued interest receivable $ 621 $ 913
Accrued interest payable 638 827
Over-collateralized on OTC derivative assets 417 743
Over-collateralized on OTC derivative liabilities 405 382
Over-collateralized on securities lending and reverse purchase agreements 80 79
Over-collateralized on repurchase agreements $ 0 $ 0