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Risk Management - Summary of Effect of Conditional Master Netting and Similar Arrangements (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position $ 20,280 $ 30,290
Amounts subject to an enforceable master netting arrangement or similar agreements (8,593) (13,243)
Financial and cash collateral pledged (received) (11,393) (16,927)
Net amount including financing entities 294 120
Net amounts excluding financing entities 294 120
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position (11,476) (16,429)
Amounts subject to an enforceable master netting arrangement or similar agreements 8,593 13,243
Financial and cash collateral pledged (received) 2,603 2,835
Net amount including financing entities (280) (351)
Net amounts excluding financing entities (79) (71)
Derivative Assets [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position 18,226 28,685
Amounts subject to an enforceable master netting arrangement or similar agreements (8,410) (13,243)
Financial and cash collateral pledged (received) (9,522) (15,323)
Net amount including financing entities 294 119
Net amounts excluding financing entities 294 119
Securities lending [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position 564 889
Financial and cash collateral pledged (received) (564) (889)
Reverse repurchase agreements [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position 1,490 716
Amounts subject to an enforceable master netting arrangement or similar agreements (183)  
Financial and cash collateral pledged (received) (1,307) (715)
Net amount including financing entities   1
Net amounts excluding financing entities   1
Derivative Liabilities [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position (10,940) (16,076)
Amounts subject to an enforceable master netting arrangement or similar agreements 8,410 13,243
Financial and cash collateral pledged (received) 2,250 2,482
Net amount including financing entities (280) (351)
Net amounts excluding financing entities (79) (71)
Repurchase agreements [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross amounts of financial instruments presented in the Consolidated Statements of Financial Position (536) (353)
Amounts subject to an enforceable master netting arrangement or similar agreements 183  
Financial and cash collateral pledged (received) $ 353 353
Net amount including financing entities  
Net amounts excluding financing entities