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Insurance and Reinsurance Contract Assets and Liabilities - Additional Information (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 02, 2024
Feb. 22, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Jan. 02, 2025
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       $ (347)   $ (174) $ (3,197)        
Decrease in pre tax other comprehensive income due to changes in acturial assumptions     $ 47                
Decrease in post tax other comprehensive income due to changes in acturial assumptions     $ 37                
Bottom of range | With effect from the fourth quarter                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Confidence level used to determine risk adjustment for non-financial risk     95.00%       95.00%        
Insurance risk                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in pre-tax net income attributed to shareholders       27   (250) $ 171        
Increase (decrease) in net income attributed to shareholders after tax       (14)   (199) 105        
Increase (decrease) in pre-tax net income attributed to participating policyholders       58   29 173        
Increase (decrease) in post-tax net income attributed to participating policyholders       74   21 165        
Increase (decrease) in contractual service margin     $ 2,638 116   (421) 2,754        
Increase in pre-tax other comprehensive income       146   771 99        
Increase in post-tax other comprehensive income       110   632 $ 73        
Increase in pre-tax other comprehensive income attributed to participating policyholders           45          
Increase in post-tax other comprehensive income attributed to participating policyholders           32          
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions     2,850                
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions     144                
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions     119                
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions     115                
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions     $ 91                
Insurance risk | Canada                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in impact of changes in pre fulfilment cash flows       (159)   (266)          
Increase (decrease) in impact of changes in net income attributed to shareholder pre-tax       52   3          
Increase (decrease) in impact of changes in net income attributed to shareholders after tax       37   2          
Increase (decrease) in impact of changes in contractual service margin flows       142   222          
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder pre-tax       2   (15)          
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder post-tax       1   (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         $ 270 895          
Increase (decrease) in impact of changes in net income attributed to shareholder pre-tax         134 (256)          
Increase (decrease) in impact of changes in net income attributed to shareholders after tax         106 (202)          
Increase (decrease) in impact of changes in contractual service margin flows         (600) (1,228)          
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder pre-tax         196 589          
Increase (decrease) in impact of changes in other comprehensive income attributed to shareholder post-tax         $ 155 466          
Insurance risk | Asia                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in contractual service margin           591          
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions           818          
Decrease in pre-tax income attributable to shareholders due to updates in incidence rates           4          
Decrease in after-tax income attributable to shareholders due to updates in incidence rates           5          
Increase (decrease) in pre-tax other comprehensive income attributable to shareholders due to updates in incidence rates           213          
Increase (decrease) in after tax other comprehensive income attributable to shareholders due to updates in incidence rates           190          
Insurance risk | Corporate and Other                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions       1              
Increase in pre-tax fulfilment cash flows due to changes in actuarial methods and assumptions           15          
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          
Decrease in contractual service margin flows due to changes in actuarial methods and assumptions           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)          
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% 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% 95.00%        
Lapse and policyholder behaviour updates                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in pre-tax fulfilment cash flows           $ 620 $ 98        
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)          
Mortality and morbidity updates                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in pre-tax fulfilment cash flows           (273) 265        
Methodology and other updates                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in pre-tax fulfilment cash flows     $ (2,850) (577)   $ (156) (3,427)        
Canada variable annuity product review                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in pre-tax fulfilment cash flows             $ (133)        
Asia | Insurance risk                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in contractual service margin     2,348                
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions     2,513                
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions     107                
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions     90                
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions     75                
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions     62                
Decrease in pre tax other comprehensive income due to changes in acturial assumptions     17                
Decrease in post tax other comprehensive income due to changes in acturial assumptions     14                
Canada | Insurance risk                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in contractual service margin     213                
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions     246                
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions     4                
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions     3                
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions     40                
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions     29                
Decrease in pre tax other comprehensive income due to changes in acturial assumptions     11                
Decrease in post tax other comprehensive income due to changes in acturial assumptions     8                
U.S. | Insurance risk                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in contractual service margin     78                
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions     91                
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions     33                
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions     26                
Decrease in pre tax other comprehensive income due to changes in acturial assumptions     20                
Decrease in post tax other comprehensive income due to changes in acturial assumptions     $ 15                
Market Movements And Updates In Morbidity Assumption In Other Geographies | Asia | Insurance risk | Asia                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Increase (decrease) in contractual service margin       574              
Reduction in pre-tax fulfillment cash flows due to changes in actuarial methods and assumptions       457              
Decrease in pre-tax income attributable to shareholders due to updates in incidence rates       159              
Decrease in after-tax income attributable to shareholders due to updates in incidence rates       157              
Increase (decrease) in pre-tax other comprehensive income attributable to shareholders due to updates in incidence rates       (53)              
Increase (decrease) in after tax other comprehensive income attributable to shareholders due to updates in incidence rates       $ (47)              
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                  
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                    
Reinsurance Group of America, Incorporated | Reinsurance contracts held                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Invested assets transferred               $ 5,400      
Reinsurance Group of America, Incorporated | Reinsurance contracts held | Forecast                      
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]                      
Insurance and investment contract net liabilities               $ 5,400      
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 | 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%
Transaction Expected To Close | LTC And Structured Settlements Blocks | 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%