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Insurance and Reinsurance Contract Assets and Liabilities - Potential Impact Arising from Changes to Non-Economic Assumptions on Long Term Care (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Translation rate 1.4382 1.3186
Translation rate potential impacts on net income, OCI and total comprehensive OCI 1.3987 1.3612
2% adverse change in future mortality rates, gross    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI $ (300) $ (300)
Net income attributed to shareholders 0 0
Other comprehensive income attributed to shareholders 0 0
Total comprehensive income attributed to shareholders 0 0
2% adverse change in future mortality rates, net    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (300) (300)
Net income attributed to shareholders 0 0
Other comprehensive income attributed to shareholders 0 0
Total comprehensive income attributed to shareholders 0 0
5% adverse change in future morbidity incidence rates, gross    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (1,400) (900)
Net income attributed to shareholders (500) (800)
Other comprehensive income attributed to shareholders 200 100
Total comprehensive income attributed to shareholders (300) (700)
5% adverse change in future morbidity incidence rates, net    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (1,300) (900)
Net income attributed to shareholders (400) (800)
Other comprehensive income attributed to shareholders 200 100
Total comprehensive income attributed to shareholders (200) (700)
5% adverse change in future morbidity claims termination rates, gross    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (1,400) (900)
Net income attributed to shareholders (1,300) (1,600)
Other comprehensive income attributed to shareholders 500 200
Total comprehensive income attributed to shareholders (800) (1,400)
5% adverse change in future morbidity claims termination rates, net    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (1,300) (900)
Net income attributed to shareholders (1,100) (1,600)
Other comprehensive income attributed to shareholders 400 200
Total comprehensive income attributed to shareholders (700) (1,400)
10% adverse change in future policy termination rates, gross    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (400) (400)
Net income attributed to shareholders 0 0
Other comprehensive income attributed to shareholders 100 0
Total comprehensive income attributed to shareholders 100 0
10% adverse change in future policy termination rates, net    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (400) (400)
Net income attributed to shareholders 0 0
Other comprehensive income attributed to shareholders 100 0
Total comprehensive income attributed to shareholders 100 0
5% increase in future expense levels, gross    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (100) (100)
Net income attributed to shareholders 0 0
Other comprehensive income attributed to shareholders 0 0
Total comprehensive income attributed to shareholders 0 0
5% increase in future expense levels, net    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
CSM net of NCI (100) (100)
Net income attributed to shareholders 0 0
Other comprehensive income attributed to shareholders 0 0
Total comprehensive income attributed to shareholders $ 0 $ 0