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Derivative and Hedging Instruments - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]    
Notional amount $ 499,021 $ 440,077
Fair value of reinsurance ceded guaranteed minimum income benefits 281 402
Fair value of reinsurance assumed guaranteed minimum income benefits 0 46
Fair value of credit and interest rate embedded derivatives 265 487
Shareholders and other equity holders’ accumulated other comprehensive income (loss) (“AOCI”):    
Disclosure of detailed information about hedging instruments [line items]    
Net losses reclassified from AOCI to net income $ 14  
Maximum time frame for which variable cash flows are hedged 28 years  
Continuing Cash Flow Hedges    
Disclosure of detailed information about hedging instruments [line items]    
Changes in fair value $ 10 (149)
CPI Cash Flow hedges    
Disclosure of detailed information about hedging instruments [line items]    
Changes in fair value $ (42) (85)
CPI Cash Flow hedges | Shareholders and other equity holders’ accumulated other comprehensive income (loss) (“AOCI”):    
Disclosure of detailed information about hedging instruments [line items]    
Maximum time frame for which variable cash flows are hedged 12 years  
De-Designated Hedges    
Disclosure of detailed information about hedging instruments [line items]    
Changes in fair value $ 0 0
Variable Annuity    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount $ 90,000 $ 82,000