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Risk Management - Summary of Gross Carrying Amount of Financial Instruments Subject to Credit Exposure (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of external credit grades [Line Items] |  |
Credit exposure | $ 341,933 | $ 311,782
Mortgages [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 48,363 | 44,742
Private placements [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 35,754 | 32,132
Policy loans [member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 6,446 | 5,808
Loans to Bank clients [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 1,793 | 1,737
Derivative Assets [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 13,703 | 15,569
Accrued investment income [member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 2,427 | 2,182
Reinsurance assets [member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 43,053 | 30,359
Other financial assets [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 4,800 | 5,253
FVTPL [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | 154,737 | 147,024
AFS [Member] |  |
Disclosure of external credit grades [Line Items] |  |
Credit exposure | $ 30,857 | $ 26,976

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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 2018-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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