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Derivative and Hedging Instruments - Additional Information (Detail) - CAD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 395,957,000,000 | $ 440,098,000,000
Fair value of reinsurance ceded guaranteed minimum income benefits | 585,000,000 | 734,000,000
Fair value of reinsurance assumed guaranteed minimum income benefits | 65,000,000 | 86,000,000
Fair value of credit and interest rate embedded derivatives | 395,000,000 | 11,000,000
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 | $ 9,000,000 |
Maximum time frame for which variable cash flows are hedged | 14 years |
Variable annuity guarantee dynamic hedging and macro equity risk hedging programs [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 77,000,000,000 | 121,000,000,000
Derivatives [member] | Interest Rate Benchmark Reform [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Notional amount | $ 211,000,000,000 | $ 258,000,000,000

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