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Risk Management - Summary of Carrying Value of Past Due but not Impaired and Impaired Financial Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | $ 3,694 | $ 452
Financial assets past due but not impaired [Member] | Private placements [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 469 | 63
Financial assets past due but not impaired [Member] | Mortgages and loans to Bank clients [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 103 | 61
Financial assets past due but not impaired [Member] | Other financial assets [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 70 | 308
Impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 313 | 228
Impaired [Member] | Private placements [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 229 | 175
Impaired [Member] | Mortgages and loans to Bank clients [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 74 | 51
Impaired [Member] | Other financial assets [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 1 |
FVTPL [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 2,130 | 20
FVTPL [Member] | Impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 9 | 2
AFS [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 922 |
Less than 90 days [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 3,437 | 405
Less than 90 days [Member] | Financial assets past due but not impaired [Member] | Private placements [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 317 | 63
Less than 90 days [Member] | Financial assets past due but not impaired [Member] | Mortgages and loans to Bank clients [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 103 | 61
Less than 90 days [Member] | Financial assets past due but not impaired [Member] | Other financial assets [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 36 | 261
Less than 90 days [Member] | FVTPL [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 2,059 | 20
Less than 90 days [Member] | AFS [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 922 |
90 days and greater [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 257 | 47
90 days and greater [Member] | Financial assets past due but not impaired [Member] | Private placements [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 152 |
90 days and greater [Member] | Financial assets past due but not impaired [Member] | Other financial assets [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | 34 | $ 47
90 days and greater [Member] | FVTPL [Member] | Financial assets past due but not impaired [Member] |  |
Disclosure of financial assets that are either past due or impaired [Line Items] |  |
Carrying value or impaired value, financial assets | $ 71 |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35H&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35M&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35I&doctype=Standard -URIDate 2022-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + Details
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