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Risk Management - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of Risk Management [line items] |  |  |
Percentage of debt securities in investment grade with ratings ranging between AAA to BBB | 97.00% | 99.00% |
Percentage of total mortgage portfolio | 13.00% | 14.00% |
Loaned securities included in invested assets | $ 30,290,000,000 | $ 21,692,000,000 |
Reverse repurchase transactions recorded as short-term receivables | 0 | 990,000,000 |
Repurchase transactions recorded as payables | $ 0 | 333,000,000 |
Term of credit default swaps | 5 years |  |
Credit protection purchased | $ 0 | 0 |
Mitigated exposure to credit risk | 0 | 12,038,000,000 |
Largest single counterparty exposure without master netting agreements or the benefit of collateral held | 13,243,000,000 | 9,188,000,000 |
Largest single counterparty exposure with master netting agreements or the benefit of collateral held | 120,000,000 | 68,000,000 |
Maximum credit exposure related to derivatives | 0 | 20,144,000,000 |
Reinsurance assets | $ 45,836,000,000 | $ 41,446,000,000 |
Percentage ceded to reinsurers | 94.00% | 94.00% |
Exposure to credit risk | $ 27,360,000,000 | $ 26,638,000,000 |
Net exposure after offsetting agreements and benefit of fair value of collateral held | 18,476,000,000 | 14,808,000,000 |
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 | 0 | 3,047,000,000 |
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 | 20.00% | 23.00% |
Securities lending [Member] |  |  |
Disclosure of Risk Management [line items] |  |  |
Loaned securities included in invested assets | $ 889,000,000 | $ 558,000,000 |

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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 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 9 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_9_b&doctype=Standard&book=b -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph IG40D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 13C -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_13C_d_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Percentage of debt securities in investment grade with ratings ranging between AAA to BBB. + References No definition available. + Details
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- Definition Term of credit default swaps. + References No definition available. + Details
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