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Insurance Contract Liabilities and Investment Contract Liabilities - Insurance Contract and Other Policy Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | $ 131,184 | $ 121,923 |
Individual participating life |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 38,621 | 34,607 |
Individual non-participating life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 39,933 | 37,528 |
Group life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 16,087 | 15,297 |
Individual annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 14,871 | 14,856 |
Group annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 14,382 | 12,614 |
Insurance contract liabilities before other policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 123,894 | 114,902 |
Policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 7,290 | 7,021 |
Canada |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 74,310 | 66,898 |
Canada | Individual participating life |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 23,526 | 21,095 |
Canada | Individual non-participating life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 13,527 | 11,435 |
Canada | Group life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 10,493 | 9,591 |
Canada | Individual annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 9,529 | 9,267 |
Canada | Group annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 14,276 | 12,461 |
Canada | Insurance contract liabilities before other policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 71,351 | 63,849 |
Canada | Policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 2,959 | 3,049 |
SLF U.S. |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 26,739 | 26,186 |
SLF U.S. | Individual participating life |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 5,611 | 5,785 |
SLF U.S. | Individual non-participating life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 13,832 | 13,239 |
SLF U.S. | Group life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 5,541 | 5,674 |
SLF U.S. | Individual annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 24 | 25 |
SLF U.S. | Group annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 7 | 6 |
SLF U.S. | Insurance contract liabilities before other policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 25,015 | 24,729 |
SLF U.S. | Policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 1,724 | 1,457 |
SLF Asia |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 23,207 | 21,525 |
SLF Asia | Individual participating life |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 8,497 | 6,651 |
SLF Asia | Individual non-participating life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 12,188 | 12,463 | $ 0
SLF Asia | Group life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 39 | 32 |
SLF Asia | Individual annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | (17) | (44) |
SLF Asia | Group annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 99 | 147 |
SLF Asia | Insurance contract liabilities before other policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 20,806 | 19,249 |
SLF Asia | Policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 2,401 | 2,276 |
Corporate |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 6,928 | 7,314 |
Corporate | Individual participating life |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 987 | 1,076 |
Corporate | Individual non-participating life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 386 | 391 |
Corporate | Group life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 14 | 0 |
Corporate | Individual annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 5,335 | 5,608 |
Corporate | Group annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 0 | 0 |
Corporate | Insurance contract liabilities before other policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 6,722 | 7,075 |
Corporate | Policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 206 | 239 |
United Kingdom | Corporate | Individual participating life |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 893 | 980 |
United Kingdom | Corporate | Individual non-participating life and health |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 238 | 240 |
United Kingdom | Corporate | Individual annuities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | 5,107 | 5,214 |
United Kingdom | Corporate | Policy liabilities |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Insurance contract liabilities | $ 156 | $ 170 |

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