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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | $ 285,729 | $ 274,246 |
Total reinsurance ceded | (42,925) | (30,359) |
Total, gross of reinsurance ceded | 328,654 | 304,605 | $ 297,505
Other insurance contract liabilities [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Total, gross of reinsurance ceded | 12,968 | 11,155 | $ 10,815
Gross insurance contract liabilities [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 285,729 | 274,246 |
Total reinsurance ceded | 42,925 | 30,359 |
Total, gross of reinsurance ceded | 328,654 | 304,605 |
Gross insurance contract liabilities [Member] | Corporate and other [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | (168) | (46) |
Total reinsurance ceded | 100 | 172 |
Total, gross of reinsurance ceded | (68) | 126 |
Gross insurance contract liabilities [Member] | Asia [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 76,127 | 62,243 |
Total reinsurance ceded | 1,332 | 911 |
Total, gross of reinsurance ceded | 77,459 | 63,154 |
Gross insurance contract liabilities [Member] | Canada [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 76,628 | 76,198 |
Total reinsurance ceded | (202) | (676) |
Total, gross of reinsurance ceded | 76,426 | 75,522 |
Gross insurance contract liabilities [Member] | U.S. [member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 133,142 | 135,851 |
Total reinsurance ceded | 41,695 | 29,952 |
Total, gross of reinsurance ceded | 174,837 | 165,803 |
Gross insurance contract liabilities [Member] | Individual insurance participating [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 57,886 | 52,438 |
Total reinsurance ceded | 11,596 | 11,492 |
Total, gross of reinsurance ceded | 69,482 | 63,930 |
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 | 38,470 | 32,737 |
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 | 10,743 | 11,132 |
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 | 8,673 | 8,569 |
Gross insurance contract liabilities [Member] | Individual insurance non-participating [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 127,035 | 113,880 |
Total reinsurance ceded | 12,303 | 11,238 |
Total, gross of reinsurance ceded | 139,338 | 125,118 |
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 | (601) | (515) |
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 | 29,547 | 22,705 |
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 | 34,677 | 34,091 |
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 | 63,412 | 57,599 |
Gross insurance contract liabilities [Member] | Annuities and pensions [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 39,572 | 49,716 |
Total reinsurance ceded | 17,927 | 6,539 |
Total, gross of reinsurance ceded | 57,499 | 56,255 |
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 | 46 | 48 |
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 | 5,062 | 4,366 |
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 | 18,339 | 19,141 |
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 | 16,125 | 26,161 |
Gross insurance contract liabilities [Member] | Other insurance contract liabilities [Member] |  |  |
Disclosure of insurance contract liabilities and reinsurance assets [line items] |  |  |
Net insurance contract liabilities | 61,236 | 58,212 |
Total reinsurance ceded | 1,099 | 1,090 |
Total, gross of reinsurance ceded | 62,335 | 59,302 |
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 | 387 | 421 |
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 | 3,048 | 2,435 |
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 | 12,869 | 11,834 |
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 | $ 44,932 | $ 43,522 |

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