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Risk Management - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of Risk Management [line items] |  |  |
Percentage of debt securities in investment grade with ratings ranging between AAA to BBB | 96.00% | 97.00% |
Percentage of total mortgage portfolio | 13.00% | 14.00% |
Loaned securities included in invested assets | $ 10,690 | $ 20,280 |
Reverse repurchase transactions recorded as short-term receivables | 895 | 1,490 |
Repurchase transactions recorded as payables | $ 895 | 536 |
Term of credit default swaps | 5 years |  |
Credit protection purchased | $ 0 | 0 |
Mitigated exposure to credit risk | 2,194 | 10,121 |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 7,949 | 8,593 |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | 215 | 294 |
Maximum credit exposure related to derivatives | 9,072 | 18,226 |
Reinsurance assets | $ 47,712 | $ 44,579 |
Percentage ceded to reinsurers | 91.00% | 94.00% |
Exposure to credit risk | $ 25,247 | $ 25,466 |
Net exposure after offsetting agreements and benefit of fair value of collateral held | 22,465 | 19,113 |
Fixed Surplus Note [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position | 0 | 0 |
Bottom of range [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Global retention limit |  |  | $ 30
Top of range [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Global retention limit |  |  | $ 35
Derivatives [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 1,582 | 2,132 |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | $ 0 | $ 0 |
AA Credit Grades or Higher [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Derivative exposure with counterparties, percentage | 36.00% | 17.00% |
Securities lending [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Loaned securities included in invested assets | $ 723 | $ 564 |

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- Definition The amount by which credit derivatives or similar instruments related to loans or receivables mitigate maximum exposure to credit risk. [Refer: Loans and receivables; Credit risk [member]; Maximum exposure to credit risk; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 9 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_9_b&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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- Definition The amount of financial instruments subject to an enforceable master netting arrangement or similar agreement that are not set off against financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph IG40D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 13C -Subparagraph d -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_13C_d_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Term of credit default swaps. + References No definition available. + Details
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