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Risk Management - Effect of Unconditional Netting (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Credit linked note    
Disclosure of credit risk exposure [line items]    
Gross amounts of financial instruments $ 1,392 $ 1,276
Amounts subject to an enforceable netting arrangement (1,392) (1,276)
Net amounts of financial instruments 0 0
Variable surplus note    
Disclosure of credit risk exposure [line items]    
Gross amounts of financial instruments (1,392) (1,276)
Amounts subject to an enforceable netting arrangement 1,392 1,276
Net amounts of financial instruments 0 0
Fixed Surplus Note    
Disclosure of credit risk exposure [line items]    
Net amounts of financial instruments presented in the Consolidated Statements of Financial Position $ 0 $ 0