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Insurance Contract Liabilities and Reinsurance Assets - Summary of Components of Gross and Net Insurance Contract Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of insurance contract liabilities and reinsurance assets [abstract] |  |  |
Gross insurance contract liabilities | $ 369,230 | $ 336,156 |
Gross benefits payable and provision for unreported claims) | 4,837 | 4,229 |
Gross policyholder amounts on deposit | 11,487 | 10,776 |
Gross insurance contract liabilities | 385,554 | 351,161 | $ 328,654
Reinsurance assets | (45,769) | (41,353) |
Net insurance contract liabilities | $ 339,785 | $ 309,808 |

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- Definition The amount of assets under reinsurance contracts in which the entity is the policyholder. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph IG20 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_IG20_c&doctype=Implementation%20Guidance&book=b -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -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-b&anchor=para_55&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities under insurance contracts and reinsurance contracts issued. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 37 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_e&doctype=Standard&book=b -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph IG20 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_IG20_a&doctype=Implementation%20Guidance&book=b -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph IG37 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_IG37_a&doctype=Implementation%20Guidance&book=b -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -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-b&anchor=para_55&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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