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Investment Contract Liabilities - Summary of Investment Contract Liabilities Measured at Amortized Cost and Fair Value Associated with Contracts (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021
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Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | $ 11,816 | $ 10,079 | $ 10,064 |
Amortized cost, gross of reinsurance ceded [Member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 11,067 | 9,281 |  | $ 9,239
Amortized cost, gross of reinsurance ceded [Member] | Asia [Member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 451 | 636 |  |
Amortized cost, gross of reinsurance ceded [Member] | Canada [member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 7,642 | 6,699 |  |
Amortized cost, gross of reinsurance ceded [Member] | U.S. [member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 1,381 | 1,535 |  |
Amortized cost, gross of reinsurance ceded [Member] | GWAM [member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 1,593 | 411 |  |
Fair value [Member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 10,994 | 9,034 |  |
Fair value [Member] | Asia [Member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 438 | 607 |  |
Fair value [Member] | Canada [member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 7,534 | 6,474 |  |
Fair value [Member] | U.S. [member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | 1,440 | 1,571 |  |
Fair value [Member] | GWAM [member] |  |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |  |
Investment contract liabilities | $ 1,582 | $ 382 |  |

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- Definition The amount of liabilities relating to investment contracts that fall within the scope of IAS 39 or IFRS 9. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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