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Invested Assets and Investment Income - Mortgage Securitization (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Securitized assets $ 6,437 $ 5,812
Secured borrowing liabilities 6,217 5,556
Net 220 256
Platinum Canadian Mortgage Trust II | Less than 1 year    
Disclosure of financial assets [line items]    
Secured borrowing liabilities 0 27
Platinum Canadian Mortgage Trust II | 1 to 3 years    
Disclosure of financial assets [line items]    
Secured borrowing liabilities 1,036 1,973
Platinum Canadian Mortgage Trust II | 3 to 5 years    
Disclosure of financial assets [line items]    
Secured borrowing liabilities 1,964 750
Platinum Canadian Mortgage Trust II | Over 5 years    
Disclosure of financial assets [line items]    
Secured borrowing liabilities 0 0
Securitized mortgages    
Disclosure of financial assets [line items]    
Securitized assets 6,415 5,780
Restricted cash and short-term securities    
Disclosure of financial assets [line items]    
Securitized assets 22 32
HELOC securitization    
Disclosure of financial assets [line items]    
Securitized assets 3,163 2,912
Secured borrowing liabilities 3,000 2,750
Net 163 162
HELOC securitization | Securitized mortgages    
Disclosure of financial assets [line items]    
Securitized assets 3,141 2,880
HELOC securitization | Restricted cash and short-term securities    
Disclosure of financial assets [line items]    
Securitized assets 22 32
CMB Securitization    
Disclosure of financial assets [line items]    
Securitized assets 3,274 2,900
Secured borrowing liabilities 3,217 2,806
Net 57 94
CMB Securitization | Securitized mortgages    
Disclosure of financial assets [line items]    
Securitized assets 3,274 2,900
CMB Securitization | Restricted cash and short-term securities    
Disclosure of financial assets [line items]    
Securitized assets $ 0 $ 0