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Derivative and Hedging Instruments - Additional Information (Detail) - CAD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 440,077,000,000 | $ 395,957,000,000
Fair value of reinsurance ceded guaranteed minimum income benefits | 402,000,000 | 535,000,000
Fair value of reinsurance assumed guaranteed minimum income benefits | 46,000,000 | 58,000,000
Fair value of credit and interest rate embedded derivatives | 487,000,000 | 395,000,000
Shareholders' accumulated other comprehensive income (loss) ("AOCI") [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Net loss that will be reclassified from AOCI to net income within next 12 months | $ 17,000,000 |
Maximum time frame for which variable cash flows are hedged | 29 years |
Cpi Hedge Relationships [Member] | Shareholders' accumulated other comprehensive income (loss) ("AOCI") [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Maximum time frame for which variable cash flows are hedged | 13 years |
Continuing Cash Flow Hedges [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
AOCI Balances | $ (149,000,000) | (85,000,000)
CPI Cash Flow Hedges [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
AOCI Balances | (85,000,000) | 0
De Designated Hedges [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
AOCI Balances | 0 | 0
Variable annuity guarantee dynamic hedging and macro equity risk hedging programs [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | 82,000,000,000 | 77,000,000,000
Derivatives [member] | Interest Rate Benchmark Reform [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 79,000,000,000 | $ 211,000,000,000

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Fair value of reinsurance assumed guaranteed minimum income benefits. + References No definition available. + Details
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