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