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Segmented Information - Summary of Results by Geographic Location (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [line items] |  |
Net premium income | $ 32,917 | $ 35,578
Net investment income (loss) | 35,400 | 33,593
Other revenue | 10,591 | 10,399
Total revenue | 78,908 | 79,570
Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 29,967 | 32,455
Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 2,950 | 3,123
Asia [member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 20,568 | 20,078
Net investment income (loss) | 7,085 | 7,750
Other revenue | 2,300 | 2,100
Total revenue | 29,953 | 29,928
Asia [member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 18,072 | 17,178
Asia [member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 2,496 | 2,900
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 8,808 | 8,749
Net investment income (loss) | 8,531 | 9,801
Other revenue | 2,671 | 2,651
Total revenue | 20,010 | 21,201
Canada [member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 8,474 | 8,388
Canada [member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 334 | 361
U.S. [member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 3,132 | 6,385
Net investment income (loss) | 19,735 | 15,816
Other revenue | 5,600 | 5,641
Total revenue | 28,467 | 27,842
U.S. [member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 3,012 | 6,523
U.S. [member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 120 | (138)
Other [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 409 | 366
Net investment income (loss) | 49 | 226
Other revenue | 20 | 7
Total revenue | 478 | 599
Other [Member] | Life and health insurance [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | 409 | $ 366
Other [Member] | Annuities and pensions [Member] |  |
Disclosure of geographical areas [line items] |  |
Net premium income | $ 0 |

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