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Insurance Risk Management (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM $ 318   $ 432
Income impact 90   (239)
Increments of rounding 25    
Single Life Insurance Contracts In Canada      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Reinsurance retention limit 40    
Single Life Insurance Contracts Outside Of Canada      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Reinsurance retention limit   $ 40  
Survivorship Life Insurance Contracts In Canada      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Reinsurance retention limit 50    
Survivorship Life Insurance Contracts Outside Of Canada      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Reinsurance retention limit   $ 50  
Policyholder Behaviour      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (274)   (30)
Income impact (75)   (35)
Expense      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (171)   7
Income impact $ 10   (9)
Insurance risk | Policyholder Behaviour      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Sensitivity, increase 10.00% 10.00%  
Sensitivity, decrease 10.00% 10.00%  
Insurance risk | Policyholder Behaviour | Insurance      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM $ (725)   (825)
Income impact 100   75
Insurance risk | Policyholder Behaviour | Reinsurance contracts held      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (950)   (850)
Income impact $ 100   75
Insurance risk | Life Mortality rates      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Sensitivity, increase 2.00% 2.00%  
Insurance risk | Life Mortality rates | Insurance      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM $ (425)   (450)
Income impact 25   50
Insurance risk | Life Mortality rates | Reinsurance contracts held      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (75)   (75)
Income impact $ (25)   (25)
Insurance risk | Annuity Mortality rates      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Sensitivity, decrease 2.00% 2.00%  
Insurance risk | Annuity Mortality rates | Insurance      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM $ (175)   (175)
Income impact 25   25
Insurance risk | Annuity Mortality rates | Reinsurance contracts held      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (175)   (175)
Income impact $ 0   25
Insurance risk | Morbidity rates      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Sensitivity, increase 500.00% 500.00%  
Sensitivity, decrease 500.00% 500.00%  
Insurance risk | Morbidity rates | Insurance      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM $ (225)   (200)
Income impact (200)   (175)
Insurance risk | Morbidity rates | Reinsurance contracts held      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (100)   (75)
Income impact $ (175)   (175)
Insurance risk | Expense      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Sensitivity, increase 5.00% 5.00%  
Insurance risk | Expense | Insurance      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM $ (175)   (175)
Income impact 0   0
Insurance risk | Expense | Reinsurance contracts held      
Disclosure of reconciliation of changes in insurance contracts by components [line items]      
Deferred in CSM (175)   (175)
Income impact $ 0   $ 0