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Financial Instrument Risk Management - Reinsurance Counterparties Exposure by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of external credit grades [line items]      
Carrying value $ 162,948 $ 157,035 $ 174,499
Credit risk | Gross exposure | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 5,794 6,115  
Credit risk | Gross exposure | AA Or A | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 3,550 3,600  
Credit risk | Gross exposure | Below A | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 2,217 2,423  
Credit risk | Gross exposure | Not rated | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 27 92  
Credit risk | Collateral | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 2,147 2,466  
Credit risk | Collateral | AA Or A | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 7 31  
Credit risk | Collateral | Below A | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 2,135 2,346  
Credit risk | Collateral | Not rated | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value 5 89  
Credit risk | Net exposure | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value $ 3,647 $ 3,649  
Net exposure 100.00% 100.00%  
Credit risk | Net exposure | AA Or A | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value $ 3,543 $ 3,569  
Net exposure 97.00% 98.00%  
Credit risk | Net exposure | Below A | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value $ 82 $ 77  
Net exposure 2.00% 2.00%  
Credit risk | Net exposure | Not rated | Total reinsurance contract held assets      
Disclosure of external credit grades [line items]      
Carrying value $ 22 $ 3  
Net exposure 1.00% 0.00%