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Interests in Structured Entities - Schedule of Securitized Holdings by the Type and Asset Quality (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 3,300 | $ 3,576
AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 2,471 | 2,503
AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 306 | 401
A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 453 | 504
BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 70 | 142
BB and below [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings |  | $ 26
CMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,725 |
CMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,653 |
CMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 72 |
RMBS [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 15 |
RMBS [Member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 8 |
RMBS [Member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 7 |
Asset backed securities [member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 1,560 |
Asset backed securities [member] | AAA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 810 |
Asset backed securities [member] | AA [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 306 |
Asset backed securities [member] | A [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | 374 |
Asset backed securities [member] | BBB [Member] |  |
Disclosure of unconsolidated structured entities [Line Items] |  |
Securitized holdings | $ 70 |

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