v3.25.4
Derivative and Hedging Instruments - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about hedging instruments [line items]    
Notional amount $ 513,010 $ 499,021
Fair value of reinsurance ceded guaranteed minimum income benefits 221 281
Fair value of reinsurance assumed guaranteed minimum income benefits 0 0
Fair value of credit and interest rate embedded derivatives 277 265
Variable Annuity 1    
Disclosure of detailed information about hedging instruments [line items]    
Notional amount 94,000 90,000
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 $ 11  
Maximum time frame for which variable cash flows are hedged 30 years  
Continuing Cash Flow Hedges    
Disclosure of detailed information about hedging instruments [line items]    
Changes in fair value $ (54) 10
CPI Cash Flow hedges    
Disclosure of detailed information about hedging instruments [line items]    
Changes in fair value $ (60) (42)
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 11 years  
De-Designated Hedges    
Disclosure of detailed information about hedging instruments [line items]    
Changes in fair value $ 0 $ 0