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Risk Management - Summary of Company's Loans Considered Impaired (Detail) - Financial assets impaired loan [member] - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value $ 303 $ 226
Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 229 175
Mortgages and loans to Bank clients [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 74 51
Gross Carrying Value [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 350 270
Gross Carrying Value [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 254 197
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 96 73
Allowances for losses [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 47 44
Allowances for losses [Member] | Private placements [Member]    
Disclosure of financial assets that are either past due or impaired [Line Items]    
Net carrying value 25 22
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 $ 22