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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | $ 3,248 | $ 3,117 |
Amortized cost, gross of reinsurance ceded [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 2,452 | 2,315 | $ 2,356
Amortized cost, gross of reinsurance ceded [Member] | U.S. fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 1,575 | 1,380 |
Amortized cost, gross of reinsurance ceded [Member] | Canadian fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 877 | 935 |
Fair value [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 2,503 | 2,618 |
Fair value [Member] | U.S. fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | 1,547 | 1,602 |
Fair value [Member] | Canadian fixed annuity products [Member] |  |  |
Disclosure of Investment Contract Liabilities [line items] |  |  |
Investment contract liabilities | $ 956 | $ 1,016 |

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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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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