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Reinsurance - Schedule of Reinsurance Assets (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | $ 4,801,000,000 | $ 3,683,000,000
Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 4,069,000,000 | 2,905,000,000
Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 218,000,000 | 221,000,000
Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 1,367,000,000 | 340,000,000
Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 2,486,000,000 | 2,307,000,000
Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 1,000,000 | 15,000,000
Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets |  | 22,000,000
Reinsurance contracts held that are liabilities | (3,000,000) |
Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 732,000,000 | 778,000,000
Canada |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 101,000,000 | (146,000,000)
Canada | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 3,000,000 | (241,000,000)
Canada | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 21,000,000 | 0
Canada | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | (282,000,000) | (547,000,000)
Canada | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 267,000,000 | 284,000,000
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
Reinsurance contracts held that are liabilities | (3,000,000) |
Canada | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 98,000,000 | 95,000,000
U.S. |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 4,306,000,000 | 3,426,000,000
U.S. | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 3,828,000,000 | 2,863,000,000
U.S. | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 18,000,000 | 7,000,000
U.S. | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 1,598,000,000 | 838,000,000
U.S. | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 2,212,000,000 | 2,018,000,000
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
Reinsurance contracts held that are liabilities | 0 |
U.S. | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 478,000,000 | 563,000,000
Asia |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 341,000,000 | 333,000,000
Asia | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 224,000,000 | 252,000,000
Asia | Individual participating life |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 179,000,000 | 214,000,000
Asia | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 38,000,000 | 33,000,000
Asia | Group life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 7,000,000 | 5,000,000
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
Reinsurance contracts held that are liabilities | 0 |
Asia | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 117,000,000 | 81,000,000
Corporate |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 53,000,000 | 70,000,000
Corporate | Reinsurance assets before other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 14,000,000 | 31,000,000
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 | 13,000,000 | 16,000,000
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 | 1,000,000 | 15,000,000
Corporate | Group annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets |  | 0
Reinsurance contracts held that are liabilities | 0 |
Corporate | Other policy assets |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 39,000,000 | 39,000,000
United Kingdom | Corporate | Individual non-participating life and health |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 13,000,000 | 16,000,000
United Kingdom | Corporate | Individual annuities |  |
Disclosure of types of insurance contracts [line items] |  |
Reinsurance assets | 1,000,000 | 15,000,000
Reinsurance Assets |  |
Disclosure of types of insurance contracts [line items] |  |
Impairment loss | $ 0 | $ 0

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