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Derivative and Hedging Instruments - Additional Information (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about hedges [Line Items]    
Notional amount $ 440,098,000,000 $ 418,978,000,000
Fair value of reinsurance ceded guaranteed minimum income benefits 734,000,000 1,007,000,000
Fair value of reinsurance assumed guaranteed minimum income benefits 86,000,000 112,000,000
Fair value of credit and interest rate embedded derivatives 11,000,000 (229,000,000)
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 $ 42,000,000  
Maximum time frame for which variable cash flows are hedged 15 years  
Variable annuity guarantee dynamic hedging and macro equity risk hedging programs [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount $ 121,000,000,000 131,000,000,000
Derivatives [member] | Interest Rate Benchmark Reform [Member]    
Disclosure of detailed information about hedges [Line Items]    
Notional amount $ 258,000,000,000 $ 274,000,000,000