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Risk Management - Summary of Company's Loans Considered Impaired (Detail) - Financial assets impaired loan [member] - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value $ 226 $ 239
Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 175 170
Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 51 69
Gross Carrying Value [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 270 346
Gross Carrying Value [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 197 249
Gross Carrying Value [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 73 97
Allowances for losses [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 44 107
Allowances for losses [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 22 79
Allowances for losses [Member] | Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value $ 22 $ 28