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Risk Management - Summary of Gross Carrying Amount of Financial Instruments Subject to Credit Exposure (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of external credit grades [Line Items] |  |
Credit exposure | $ 400,369 | $ 362,627
Mortgages [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 50,207 | 49,376
Private placements [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 40,756 | 37,979
Policy loans [member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 6,398 | 6,471
Loans to Bank clients [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 1,976 | 1,740
Derivative Assets [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 27,793 | 19,449
Accrued investment income [member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 2,523 | 2,416
Reinsurance assets [member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 45,836 | 41,446
Other financial assets [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 6,156 | 5,628
FVTPL [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 183,061 | 166,307
AFS [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | $ 35,663 | $ 31,815

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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