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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, 2020 | Dec. 31, 2019
--- | --- | ---
Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | $ 29,513 | $ 28,824
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 | 8,621 | 8,840
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 | 8,669 | 8,871
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 | 5,799 | 5,371
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 | 2,960 | 2,469
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 | 3,464 | 3,273
Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 310 | 476
Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 40,756 | 37,979
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 | 70,579 | 67,279
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 | 1,052 | 1,147
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 | 110 | 132
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 | 66 | 77
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 | 613 | 640
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 | 25 | 38
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 | 238 | 260
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 | 1,061 | 1,098
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 | 2,113 | 2,245
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 | 5,597 | 5,602
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 | 1,339 | 1,374
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 | 1,297 | 1,540
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 | 1,675 | 1,585
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 | 320 | 364
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 | 966 | 739
AA [Member] | Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value |  | 27
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 | 4,829 | 5,513
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 | 10,426 | 11,142
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 | 16,872 | 16,286
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 | 4,761 | 5,285
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 | 5,948 | 5,808
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 | 2,896 | 2,397
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 | 2,353 | 1,820
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 | 914 | 976
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 | 127 | 137
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 | 15,585 | 14,311
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 | 32,584 | 30,734
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 | 5,241 | 5,682
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 | 2,242 | 2,039
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 | 1,174 | 1,402
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 | 582 | 714
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 | 259 | 237
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 | 984 | 1,290
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 | 77 | 312
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 | 15,825 | 14,139
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 | 21,143 | 20,133
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 | 723 | 81
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 | 168 | 10
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 | 164 | 26
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 | 33 | 35
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 | 3 | 10
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 | 355 |
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 | 106 |
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 | 1,206 | 823
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 | 2,035 | 904
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 | 28 | 26
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 | 1 |
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 | 20 | 18
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 | 7 | 8
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 | 2,250 | 2,095
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 | $ 2,278 | $ 2,121

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