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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 3,442 | $ 3,888
AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 2,465 | 2,805
AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 32 | 648
A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 661 | 372
BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 208 | $ 63
BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 76 |
CMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,491 |
CMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,438 |
CMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 53 |
RMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 10 |
RMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 7 |
RMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 3 |
Asset backed securities [member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,941 |
Asset backed securities [member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,020 |
Asset backed securities [member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 32 |
Asset backed securities [member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 605 |
Asset backed securities [member] | BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 208 |
Asset backed securities [member] | BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 76 |

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