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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 2,609 | $ 3,229
AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,775 | 2,346
AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 9 | 11
A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 590 | 641
BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 232 | 227
BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 3 | $ 4
CMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 731 |
CMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 675 |
CMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 56 |
RMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 8 |
RMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 5 |
RMBS [Member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 3 |
Asset backed securities [member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,870 |
Asset backed securities [member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,095 |
Asset backed securities [member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 6 |
Asset backed securities [member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 534 |
Asset backed securities [member] | BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 232 |
Asset backed securities [member] | BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 3 |

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