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Accounting and Reporting Changes - Schedule of Impact on Loss Allowances for Invested Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2023
Jan. 01, 2023
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance $ 724 $ 929  
IAS 39 [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
Impairment allowance 47    
IAS 39 [Member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
Impairment allowance 47    
IAS 39 [Member] | FVOCI [Member] | Private placements [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
Impairment allowance 25    
IAS 39 [Member] | FVOCI [Member] | Mortgages [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
Impairment allowance 10    
IAS 39 [Member] | Amortized cost [Member] | Mortgages [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
Impairment allowance 7    
IAS 39 [Member] | Amortized cost [Member] | Loans to bank clients [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
Impairment allowance $ 5    
IFRS 9 [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     $ 724
IFRS 9 [Member] | Of balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     11
IFRS 9 [Member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     713
IFRS 9 [Member] | FVOCI [Member] | Debt securities [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     348
IFRS 9 [Member] | FVOCI [Member] | Private placements [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     255
IFRS 9 [Member] | FVOCI [Member] | Mortgages [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     83
IFRS 9 [Member] | FVOCI [Member] | Other invested assets [member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     13
IFRS 9 [Member] | Amortized cost [Member] | On balance sheet exposures [Member]      
Disclosure of Detailed Information About Loss allowances fIAS 39 to the Expected Credit Losses Impairment Allowance under IFRS [Line Items]      
ECL allowance     $ 14