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IFRS 7 Disclosures - Schedule of Maturity of Financial Liabilities (Parenthetical) (Detail) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Carrying value of deposits from Bank clients CAD 18,131 CAD 17,919
Level 2 [Member]    
Disclosure Of Maturity Analysis For Financial Liabilities [Line Items]    
Fair value of deposits from Bank clients CAD 18,149 CAD 17,978