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Segmented Information - Summary of Results by Geographic Location (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [line items] |  |
Net premium income | $ 24,012 | $ 28,210
Net investment income (loss) | 4,532 | 19,367
Other revenue | 10,428 | 10,746
Total revenue | 38,972 | 58,323
Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 30,352 | 24,355
Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | (6,340) | 3,855
Asia [member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 18,185 | 15,783
Net investment income (loss) | 371 | 4,258
Other revenue | 2,115 | 1,632
Total revenue | 20,671 | 21,673
Asia [member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 15,010 | 13,215
Asia [member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 3,175 | 2,568
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 9,013 | 4,337
Net investment income (loss) | 2,933 | 4,642
Other revenue | 2,904 | 3,187
Total revenue | 14,850 | 12,166
Canada [member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 8,561 | 3,894
Canada [member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 452 | 443
U.S. [member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | (3,625) | 7,624
Net investment income (loss) | 1,032 | 10,407
Other revenue | 5,395 | 5,911
Total revenue | 2,802 | 23,942
U.S. [member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 6,342 | 6,780
U.S. [member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | (9,967) | 844
Other [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 439 | 466
Net investment income (loss) | 196 | 60
Other revenue | 14 | 16
Total revenue | 649 | 542
Other [Member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | $ 439 | $ 466

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