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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
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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

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