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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of insurance contract liabilities and reinsurance assets [abstract] |  |  |
Gross insurance contract liabilities | $ 352,153 | $ 374,890 |
Gross benefits payable and provision for unreported claims) | 5,610 | 5,251 |
Gross policyholder amounts on deposit | 13,642 | 12,134 |
Gross insurance contract liabilities | 371,405 | 392,275 | $ 385,554
Reinsurance assets | (47,674) | (44,531) |
Net insurance contract liabilities | $ 323,731 | $ 347,744 |

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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 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph IG20 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_IG20_c&doctype=Implementation%20Guidance&book=b -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-b&anchor=para_55&doctype=Standard&book=b -URIDate 2022-03-24 + 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 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_e&doctype=Standard&book=b -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 37 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_37_b&doctype=Standard&book=b -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph IG20 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_IG20_a&doctype=Implementation%20Guidance&book=b -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph IG37 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_IG37_a&doctype=Implementation%20Guidance&book=b -URIDate 2022-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2023-01-01 -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-b&anchor=para_55&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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