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Risk Management - Summary of Credit Quality and Carrying Value of Commercial Mortgages and Private Placements (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | $ 32,654 | $ 31,099
Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 8,762 | 8,798
Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 9,073 | 8,734
Commercial mortgages [Member] | Multi-family residential [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 7,367 | 6,996
Commercial mortgages [Member] | Industrial [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 4,720 | 3,559
Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 2,732 | 3,012
Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 359 | 361
Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 47,057 | 42,842
Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 80,070 | 74,302
AAA [Member] | Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 967 | 985
AAA [Member] | Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 113 | 113
AAA [Member] | Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 102 | 56
AAA [Member] | Commercial mortgages [Member] | Multi-family residential [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 500 | 557
AAA [Member] | Commercial mortgages [Member] | Industrial [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 72 | 47
AAA [Member] | Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 180 | 212
AAA [Member] | Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 904 | 976
AAA [Member] | Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 1,871 | 1,961
AA [Member] | Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 7,118 | 5,851
AA [Member] | Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 1,526 | 1,340
AA [Member] | Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 1,460 | 1,256
AA [Member] | Commercial mortgages [Member] | Multi-family residential [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 2,213 | 1,869
AA [Member] | Commercial mortgages [Member] | Industrial [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 929 | 376
AA [Member] | Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 990 | 1,010
AA [Member] | Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 6,991 | 5,720
AA [Member] | Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 14,109 | 11,571
A [Member] | Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 18,683 | 18,549
A [Member] | Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 4,872 | 5,179
A [Member] | Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 5,950 | 6,004
A [Member] | Commercial mortgages [Member] | Multi-family residential [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 3,751 | 3,771
A [Member] | Commercial mortgages [Member] | Industrial [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 3,312 | 2,808
A [Member] | Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 798 | 787
A [Member] | Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 119 | 119
A [Member] | Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 16,534 | 16,147
A [Member] | Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 35,336 | 34,815
BBB [Member] | Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 5,589 | 5,278
BBB [Member] | Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 2,055 | 1,936
BBB [Member] | Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 1,471 | 1,291
BBB [Member] | Commercial mortgages [Member] | Multi-family residential [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 892 | 767
BBB [Member] | Commercial mortgages [Member] | Industrial [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 407 | 328
BBB [Member] | Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 764 | 956
BBB [Member] | Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 240 | 242
BBB [Member] | Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 17,176 | 16,220
BBB [Member] | Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 23,005 | 21,740
BB [Member] | Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 262 | 394
BB [Member] | Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 194 | 228
BB [Member] | Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 57 | 87
BB [Member] | Commercial mortgages [Member] | Multi-family residential [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 11 | 32
BB [Member] | Commercial mortgages [Member] | Industrial [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value |  | 0
BB [Member] | Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value |  | 47
BB [Member] | Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value |  | 0
BB [Member] | Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 1,105 | 1,161
BB [Member] | Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 1,367 | 1,555
B and lower [Member] | Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 35 | 42
B and lower [Member] | Commercial mortgages [Member] | Retail [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 2 | 2
B and lower [Member] | Commercial mortgages [Member] | Office [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 33 | 40
B and lower [Member] | Commercial mortgages [Member] | Other [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value |  | 0
B and lower [Member] | Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 4,347 | 2,618
B and lower [Member] | Commercial mortgages and private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | $ 4,382 | $ 2,660

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