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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 2,154 | $ 2,575
AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,375 | 1,770
AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 227 | 9
A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 438 | 574
BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 107 | 219
BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 7 | $ 3
CMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 425 |
CMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 425 |
CMBS [Member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
CMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
CMBS [Member] | BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
CMBS [Member] | BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
RMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 7 |
RMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 4 |
RMBS [Member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
RMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 3 |
RMBS [Member] | BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
RMBS [Member] | BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 0 |
Asset backed securities [member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,722 |
Asset backed securities [member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 946 |
Asset backed securities [member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 227 |
Asset backed securities [member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 435 |
Asset backed securities [member] | BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 107 |
Asset backed securities [member] | BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 7 |

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