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IFRS 7 Disclosures - Schedule of Maturity of Financial Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Maturity Analysis For Financial Liabilities [line items]    
Long-term debt $ 4,769 $ 4,784
Capital instruments 8,732 8,387
Derivatives 7,803 7,822
Deposits from bank clients 19,684 18,131
Lease obligations 575 838
Less than 1 year [Member]    
Disclosure Of Maturity Analysis For Financial Liabilities [line items]    
Long-term debt   400
Derivatives 359 224
Deposits from bank clients 15,351  
Lease obligations 129  
1 to 3 years [Member]    
Disclosure Of Maturity Analysis For Financial Liabilities [line items]    
Long-term debt 681  
Derivatives 229 149
Deposits from bank clients 2,147  
Lease obligations 203  
3 to 5 years [Member]    
Disclosure Of Maturity Analysis For Financial Liabilities [line items]    
Derivatives 227 168
Deposits from bank clients 2,185  
Lease obligations 93  
Over 5 years [Member]    
Disclosure Of Maturity Analysis For Financial Liabilities [line items]    
Long-term debt 4,088 3,758
Capital instruments 8,732  
Derivatives 6,988 $ 7,281
Deposits from bank clients 1  
Lease obligations $ 150