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Insurance Contract Liabilities and Reinsurance Assets - Summary of Composition of Insurance Contract Liabilities and Reinsurance Assets by Line of Business and Reporting Segment (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | $ 339,785 | $ 309,808 |
Total reinsurance ceded | 45,769 | 41,353 |
Total, gross of reinsurance ceded | 385,554 | 351,161 | $ 328,654
Other insurance contract liabilities [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Total, gross of reinsurance ceded | 14,377 | 13,219 | $ 12,968
Gross insurance contract liabilities [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 339,785 | 309,808 |
Total reinsurance ceded | 45,769 | 41,353 |
Total, gross of reinsurance ceded | 385,554 | 351,161 |
Gross insurance contract liabilities [Member] | Corporate and other [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | (458) | (285) |
Total reinsurance ceded | 324 | 224 |
Total, gross of reinsurance ceded | (134) | (61) |
Gross insurance contract liabilities [Member] | Asia [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 102,958 | 87,937 |
Total reinsurance ceded | 2,127 | 1,432 |
Total, gross of reinsurance ceded | 105,085 | 89,369 |
Gross insurance contract liabilities [Member] | Canada [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 90,346 | 83,297 |
Total reinsurance ceded | 443 | 286 |
Total, gross of reinsurance ceded | 90,789 | 83,583 |
Gross insurance contract liabilities [Member] | U.S. [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 146,939 | 138,859 |
Total reinsurance ceded | 42,875 | 39,411 |
Total, gross of reinsurance ceded | 189,814 | 178,270 |
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 76,480 | 66,817 |
Total reinsurance ceded | 8,780 | 9,869 |
Total, gross of reinsurance ceded | 85,260 | 76,686 |
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | Corporate and other [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 0 |  |
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | Asia [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 55,262 | 46,071 |
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | Canada [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 12,796 | 12,012 |
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] | U.S. [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 8,422 | 8,734 |
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 148,715 | 138,096 |
Total reinsurance ceded | 19,944 | 13,588 |
Total, gross of reinsurance ceded | 168,659 | 151,684 |
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | Corporate and other [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | (684) | (609) |
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | Asia [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 36,930 | 32,887 |
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | Canada [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 44,468 | 39,655 |
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] | U.S. [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 68,001 | 66,163 |
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 41,902 | 38,585 |
Total reinsurance ceded | 16,065 | 16,850 |
Total, gross of reinsurance ceded | 57,967 | 55,435 |
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | Corporate and other [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 34 | 36 |
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | Asia [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 7,114 | 5,915 |
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | Canada [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 18,462 | 17,871 |
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] | U.S. [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 16,292 | 14,763 |
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 72,688 | 66,310 |
Total reinsurance ceded | 980 | 1,046 |
Total, gross of reinsurance ceded | 73,668 | 67,356 |
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | Corporate and other [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 192 | 288 |
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | Asia [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 3,652 | 3,064 |
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | Canada [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 14,620 | 13,759 |
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] | U.S. [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | $ 54,224 | $ 49,199 |

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