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Financial Instrument Risk Management - Reinsurance Counterparties Exposure by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of external credit grades [line items]    
Carrying value $ 178,698 $ 162,948
Credit risk | Gross exposure | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 6,318 5,794
Credit risk | Gross exposure | AA or A | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 3,670 3,550
Credit risk | Gross exposure | Below 'A' | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 2,531 2,217
Credit risk | Gross exposure | Not rated | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 117 27
Credit risk | Collateral | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 2,471 2,147
Credit risk | Collateral | AA or A | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 4 7
Credit risk | Collateral | Below 'A' | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 2,416 2,135
Credit risk | Collateral | Not rated | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value 51 5
Credit risk | Net exposure | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value $ 3,847 $ 3,647
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 $ 3,666 $ 3,543
Net exposure 95.00% 97.00%
Credit risk | Net exposure | Below 'A' | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value $ 115 $ 82
Net exposure 3.00% 2.00%
Credit risk | Net exposure | Not rated | Total reinsurance contract held assets    
Disclosure of external credit grades [line items]    
Carrying value $ 66 $ 22
Net exposure 2.00% 1.00%