v3.25.4
Insurance and Reinsurance Contract Assets and Liabilities - Additional Information (Detail)
$ in Millions, $ in Billions
 12 Months Ended
Jan. 02, 2025
CAD ($)
Apr. 02, 2024
CAD ($)
Feb. 22, 2024
CAD ($)
Dec. 31, 2025
CAD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2025
USD ($)
Nov. 20, 2024
Mar. 25, 2024
Dec. 11, 2023
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       $ 605   $ 174        
Insurance risk                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       (1,500) $ (1.1)          
Increase (decrease) in pre-tax net income attributed to shareholders       244   250        
Increase (decrease) in net income attributed to shareholders after tax       216   199        
Increase (decrease) in pre-tax net income attributed to participating policyholders       88   29        
Increase (decrease) in post-tax net income attributed to participating policyholders       67   21        
Increase (decrease) in contractual service margin       1,080   421        
Increase in pre-tax other comprehensive income       52   771        
Increase in post-tax other comprehensive income       73   632        
Increase in pre-tax other comprehensive income attributed to participating policyholders       91   45        
Increase in post-tax other comprehensive income attributed to participating policyholders       70   32        
Increase in pre-tax fulfilment cash flows due to changes in actuarial methods and assumptions       500 0.3          
Insurance risk | Canada                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in impact of changes in pre fulfilment cash flows       382   266        
Increase (decrease) in impact of changes in net income attributed to shareholder pre-tax       80   3        
Increase (decrease) in impact of changes in net income attributed to shareholders after tax       58   2        
Increase (decrease) in impact of changes in contractual service margin flows       348   222        
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder pre-tax       98   15        
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder post-tax       71   10        
Insurance risk | U.S.                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in impact of changes in pre fulfilment cash flows       179   895        
Increase (decrease) in impact of changes in net income attributed to shareholder pre-tax       298   256        
Increase (decrease) in impact of changes in net income attributed to shareholders after tax       235   202        
Increase (decrease) in impact of changes in contractual service margin flows       43   1,228        
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder pre-tax       75   589        
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder post-tax       60   466        
Insurance risk | Asia                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in contractual service margin       704   591        
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions       418   818        
Decrease in pre-tax income attributable to shareholders due to updates in incidence rates       26   4        
Decrease in after-tax income attributable to shareholders due to updates in incidence rates       39   5        
Increase (decrease) in pre-tax other comprehensive income attributable to shareholders due to updates in incidence rates       224   213        
Increase (decrease) in after tax other comprehensive income attributable to shareholders due to updates in incidence rates       203   190        
Insurance risk | Corporate and Other                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase in pre-tax fulfilment cash flows due to changes in actuarial methods and assumptions       16   15        
Decrease in contractual service margin flows due to changes in actuarial methods and assumptions       15   6        
Increase (decrease) in pre tax other comprehensive income due to changes in acturial methods and assumptions       1   16        
Increase (decrease) in post tax other comprehensive income due to changes in acturial methods and assumptions       $ 1   14        
Increase in pre-tax net income attributable to shareholders due to changes in actuarial methods and assumptions           7        
Increase in post-tax net income attributable to shareholders due to changes in actuarial methods and assumptions           6        
Insurance risk | Bottom of range                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Confidence level used to determine risk adjustment for non-financial risk       90.00%     90.00%      
Insurance risk | Top of range                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Confidence level used to determine risk adjustment for non-financial risk       95.00%     95.00%      
Hong Kong health insurance product reserving approach                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       $ (463)            
Methodology and other updates                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       (207)   (156)        
Lapse and policyholder behaviour updates                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       (181)   (620)        
Long-term care triennial review                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       (77)            
Long-term care triennial review | Insurance risk                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase in pre-tax fulfilment cash flows due to changes in actuarial methods and assumptions       1,900 $ 1.4          
Insurance contract liabilities net of reinsurance actual premium pretax increase       3,200     $ 2.3      
Mortality and morbidity updates                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows       $ 39   273        
Reinsurance contract and other risk adjustment review                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows           $ (427)        
Reinsurance contract and other risk adjustment review | Bottom of range                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Confidence level used to determine risk adjustment for non-financial risk           90.00%        
Reinsurance contract and other risk adjustment review | Top of range                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Confidence level used to determine risk adjustment for non-financial risk           95.00%        
Expense updates                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows           $ 406        
Financial related updates                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Increase (decrease) in pre-tax fulfilment cash flows           $ 386        
Reinsurance Group of America, Incorporated | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Invested assets transferred $ 5,400                  
Insurance and investment contract net liabilities 5,200                  
Reinsurance contractual service margin $ 201                  
RGA Life Reinsurance Company of Canada | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Invested assets transferred   $ 5,500                
Insurance and investment contract net liabilities   5,400                
Reinsurance contractual service margin   $ 213                
Global Atlantic Financial Group | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Invested assets transferred     $ 13,400              
Insurance and investment contract net liabilities     13,200              
Reinsurance contractual service margin     308              
Financial assets     $ 134              
Transaction Has Closed | Administering The Insurance Contracts | RGA Life Reinsurance Company of Canada | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Percentage share in the insurance contracts                 100.00%  
Transaction Has Closed | LTC Block | Administering The Insurance Contracts | Reinsurance Group of America, Incorporated | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Percentage share in the insurance contracts               75.00%    
Transaction Has Closed | LTC Block | Administering The Insurance Contracts | Global Atlantic Financial Group | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Percentage share in the insurance contracts                   80.00%
Transaction Has Closed | Other Block | Administering The Insurance Contracts | Global Atlantic Financial Group | Reinsurance contracts held                    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                    
Percentage share in the insurance contracts                   100.00%