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Insurance and Reinsurance Contract Assets and Liabilities - Additional Information (Detail)
$ in Millions, $ in Billions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2023
CAD ($)
Sep. 30, 2023
CAD ($)
Sep. 30, 2023
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 11, 2023
Dec. 31, 2022
USD ($)
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in post tax other comprehensive income due to changes in acturial assumptions $ 37              
Decrease in pre tax other comprehensive income due to changes in acturial assumptions $ 47              
Increase (decrease) in pre-tax fulfilment cash flows   $ (347)   $ (3,197)        
Bottom of range [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Percentage of Risk Adjustment Confidence Level 90.00%     90.00%        
Bottom of range [Member] | With effect from the fourth quarter [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Confidence level based on risk adjustment 95.00%     95.00%        
Top of range [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Percentage of Risk Adjustment Confidence Level 95.00%     95.00%        
Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions $ 91              
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions 115              
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 the shareholders due to changes in acturial methods and assumptions 144              
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions 2,850              
Increase In Impact Of Changes In Other Comprehensive Income Attributed To Shareholder Post Tax   1 $ 155          
Increase In Impact Of Changes In Other Comprehensive Income Attributed To Shareholder Pre Tax   2 196          
Increase Decrease In Impact Of Changes In Contractual Service Margin Flows   142 (600)          
Increase Decrease In Impact Of Changes In Net Income Attributed To Shareholders After Tax   37 106          
Increase Decrease In Impact Of Changes In Net Income Attributed To Shareholder Pre Tax   52 134          
Increase Decrease In Impact Of Changes In PreFulfilment CashFlows   (159) 270          
Increase in pre-tax net income attributed to shareholders   27   $ 171 $ 23      
Increase (decrease) in post-tax net income attributed to shareholders   (14)   105 26      
Increase (decrease) in pre-tax net income attributed to participating policyholders   58   173 (26)      
Increase (decrease) in post-tax net income attributed to participating policyholders   74   165 (18)      
Increase (decrease) in contractual service margin $ 2,638 116   2,754 (279)      
Increase (decrease) in pre-tax fulfilment cash flows         192      
Increase in pre-tax other comprehensive income   146   99 90      
Increase in post-tax other comprehensive income   110   $ 73 73      
Insurance risk [member] | Bottom of range [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Confidence level based on risk adjustment 90.00%     90.00%        
Insurance risk [member] | Top of range [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Confidence level based on risk adjustment 95.00%     95.00%        
Reinsurance contracts held [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Cumulative pre-tax decrease to the contractual service margin         905      
Long-term care triennial review [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase (decrease) in pre-tax fulfilment cash flows         118      
Future premium increases in pre-tax fulfilment cash flows         2,500 $ 1.9    
Increase in actual premium pre-tax         $ 2,500     $ 1.9
Percentage of annual premium increase         30.00% 30.00%    
Canada variable annuity product review [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase (decrease) in pre-tax fulfilment cash flows       $ (133)        
Mortality and morbidity updates [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase (decrease) in pre-tax fulfilment cash flows       265 $ 83      
Lapse and policyholder behaviour updates [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase (decrease) in pre-tax fulfilment cash flows       98 234      
Methodology and other updates [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase (decrease) in pre-tax fulfilment cash flows $ (2,850) (577)   $ (3,427) $ (243)      
Canada [member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in post tax other comprehensive income due to changes in acturial assumptions 8              
Decrease in pre tax other comprehensive income due to changes in acturial assumptions 11              
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions 29              
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions 40              
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 the shareholders due to changes in acturial methods and assumptions 4              
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions 246              
Increase (decrease) in contractual service margin 213              
U.S. [member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in post tax other comprehensive income due to changes in acturial assumptions 15              
Decrease in pre tax other comprehensive income due to changes in acturial assumptions 20              
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions 26              
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions 33              
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions 91              
Increase (decrease) in contractual service margin 78              
Asia [Member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in post tax other comprehensive income due to changes in acturial assumptions 14              
Decrease in pre tax other comprehensive income due to changes in acturial assumptions 17              
Increase in post tax net income attributable to policyholders due to changes in acturial assumptions 62              
Increase in pre tax net income attributable to policyholders due to changes in acturial assumptions 75              
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 the shareholders due to changes in acturial methods and assumptions 107              
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions 2,513              
Increase (decrease) in contractual service margin $ 2,348              
Updates In Lapse Assumptions And Morbidity Updates In Other Geographies [Member] | Asia [Member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in post tax income attributable to the shareholders due to changes in acturial methods and assumptions   9            
Decrease in pre tax income attributable to the shareholders due to changes in acturial methods and assumptions   25            
Increase in post tax other comprehensive income due to changes in acturial methods and assumptions   58            
Increase in pre tax other comprehensive income due to changes in acturial methods and assumptions   76            
Increase in pre tax fulfillment cash flows due to changes in acturial methods and assumptions   62            
Increase (decrease) in contractual service margin   (120)            
Triannual Review Of Long Term Insurance Products [Member] | U.S. [member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in post tax income attributable to the shareholders due to changes in acturial methods and assumptions   12            
Decrease in pre tax income attributable to the shareholders due to changes in acturial methods and assumptions   16            
Increase in post tax other comprehensive income due to changes in acturial methods and assumptions   86            
Increase in pre tax other comprehensive income due to changes in acturial methods and assumptions   110            
Increase in pre tax fulfillment cash flows due to changes in acturial methods and assumptions   108            
Increase (decrease) in contractual service margin   (202)            
Update In Lapse Assumptions For Certain Insurance Productions And Dividend Rate On Participating Products And Changes In Discount Rates [Member] | Canada [member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Increase in post tax other comprehensive income due to changes in acturial methods and assumptions   71            
Increase in pre tax other comprehensive income due to changes in acturial methods and assumptions   96            
Increase in post tax net income attributable to the shareholders due to changes in acturial methods and assumptions   47            
Increase in pre tax net income attributable to the shareholders due to changes in acturial methods and assumptions   64            
Increase in pre tax fulfillment cash flows due to changes in acturial methods and assumptions   22            
Increase (decrease) in contractual service margin   43            
Market Movements And Updates In Morbidity Assumption In Other Geogrpahies [Member] | Asia [Member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Decrease in after tax other comprehensive income attributable to shareholders due to updates in incidence rates   47            
Decrease in pre tax other comprehensive income attributable to shareholders due to updates in incidence rates   53            
Decrease in after tax income attributable to shareholders due to updates in incidence rates   157            
Decrease in pre tax income attributable to shareholders due to updates in incidence rates   159            
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions   457            
Increase (decrease) in contractual service margin   574            
Unallocated amounts [member] | Insurance risk [member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Reduction in post tax other comprehensive income due to changes in acturial methods and assumptions   1            
Reduction in pre tax other comprehensive income due to changes in acturial methods and assumptions   1            
Reduction in pre tax fulfillment cash flows due to changes in acturial methods and assumptions   1            
Transaction Has Closed [Member] | Administering The Insurance Contracts [Member] | Global Atlantic Financial Group [Member] | Reinsurance contracts held [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Insurance and investment contract net liabilities   $ 13,000 $ 13,000          
Transaction Has Closed [Member] | Other Block [Member] | Administering The Insurance Contracts [Member] | Global Atlantic Financial Group [Member] | Reinsurance contracts held [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Percentage share in the insurance contracts             80.00%  
Transaction Has Closed [Member] | LTC Block [Member] | Administering The Insurance Contracts [Member] | Global Atlantic Financial Group [Member] | Reinsurance contracts held [Member]                
Disclosure of sensitivity analysis for actuarial assumptions [line items]                
Percentage share in the insurance contracts             100.00%