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Reinsurance - Schedule of Reinsurance Assets (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | $ 3,683,000,000 | $ 3,843,000,000
Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 2,905,000,000 | 3,126,000,000
Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 221,000,000 | 329,000,000
Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 340,000,000 | 313,000,000
Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 2,307,000,000 | 2,327,000,000
Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 15,000,000 | 17,000,000
Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 22,000,000 | 140,000,000
Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 778,000,000 | 717,000,000
Canada |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | (146,000,000) | 68,000,000
Canada | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | (241,000,000) | (36,000,000)
Canada | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 57,000,000
Canada | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | (547,000,000) | (636,000,000)
Canada | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 284,000,000 | 403,000,000
Canada | Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
Canada | Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 22,000,000 | 140,000,000
Canada | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 95,000,000 | 104,000,000
U.S. |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 3,426,000,000 | 3,319,000,000
U.S. | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 2,863,000,000 | 2,811,000,000
U.S. | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 7,000,000 | 9,000,000
U.S. | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 838,000,000 | 882,000,000
U.S. | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 2,018,000,000 | 1,920,000,000
U.S. | Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
U.S. | Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
U.S. | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 563,000,000 | 508,000,000
Asia |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 333,000,000 | 381,000,000
Asia | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 252,000,000 | 316,000,000
Asia | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 214,000,000 | 263,000,000
Asia | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 33,000,000 | 49,000,000
Asia | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 5,000,000 | 4,000,000
Asia | Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
Asia | Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
Asia | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 81,000,000 | 65,000,000
Corporate |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 70,000,000 | 75,000,000
Corporate | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 31,000,000 | 35,000,000
Corporate | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
Corporate | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 16,000,000 | 18,000,000
Corporate | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
Corporate | Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 15,000,000 | 17,000,000
Corporate | Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 0 | 0
Corporate | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 39,000,000 | 40,000,000
United Kingdom | Corporate | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 16,000,000 | 18,000,000
United Kingdom | Corporate | Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 15,000,000 | 17,000,000
Reinsurance Assets |  |
Disclosure of types of insurance contracts [line items] |  |
Impairment loss | $ 0 | $ 0

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