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Derivative and Hedging Instruments - Additional Information (Detail) - CAD ($)
 12 Months Ended
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