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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, 2018 | Dec. 31, 2017
--- | --- | ---
Commercial mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | $ 28,215 | $ 25,574
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 | 8,377 | 8,141
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 | 8,706 | 7,709
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 | 5,323 | 4,449
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 | 2,814 | 2,583
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 | 2,995 | 2,692
Agricultural mortgages [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 552 | 589
Private placements [Member] |  |
Disclosure of credit quality and carrying value of commercial mortgages and private placements [line items] |  |
Credit quality and carrying value | 35,754 | 32,132
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 | 64,521 | 58,295
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 | 1,076 | 1,085
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 | 82 | 110
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 | 56 | 57
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 | 523
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 | 36 | 33
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 | 289 | 362
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 | 1,143 | 1,038
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 | 2,219 | 2,123
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 | 5,146 | 4,901
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 | 1,524 | 1,517
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 | 1,495 | 1,272
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 | 1,427 | 1,395
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 | 366 | 386
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 | 334 | 331
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 | 163 | 159
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 | 4,968 | 4,246
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 | 10,277 | 9,306
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 | 15,440 | 13,357
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 | 4,459 | 4,363
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 | 5,454 | 4,635
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 | 2,407 | 1,805
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 | 1,953 | 1,542
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 | 1,167 | 1,012
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 | 13,304 | 11,978
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 | 28,744 | 25,335
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 | 6,246 | 5,873
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 | 2,227 | 2,050
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 | 1,650 | 1,647
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 | 839 | 726
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 | 339 | 477
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 | 1,191 | 973
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 | 389 | 405
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 | 14,055 | 13,160
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 | 20,690 | 19,438
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 | 213 | 273
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 | 11 | 44
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 | 45 | 70
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 | 37 |
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 | 120 | 145
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 |  | 14
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 |  | 25
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 | 733 | 717
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 | 946 | 1,015
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 | 94 | 85
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 | 74 | 57
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 | 6 | 28
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 | 14 |
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 | 1,551 | 993
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 | $ 1,645 | $ 1,078

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