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Total Invested Assets and Related Net Investment Income - Fair Values of Derivative Financial Instruments by Major Class (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of financial assets [line items]    
Fair value $ 178,651 $ 162,854
Financial liabilities, at fair value (21,236) (18,801)
Derivatives    
Disclosure of financial assets [line items]    
Fair value 1,971 2,183
Financial liabilities, at fair value (2,077) (1,311)
Interest rate contracts    
Disclosure of financial assets [line items]    
Fair value 392 418
Financial liabilities, at fair value (822) (667)
Interest rate contracts | Derivative investments    
Disclosure of financial assets [line items]    
Fair value 392 418
Financial liabilities, at fair value (822) (667)
Foreign currency swap contracts    
Disclosure of financial assets [line items]    
Fair value 1,411 1,676
Financial liabilities, at fair value (1,198) (633)
Foreign currency swap contracts | Derivative investments    
Disclosure of financial assets [line items]    
Fair value 1,403 1,674
Financial liabilities, at fair value (1,195) (614)
Foreign currency swap contracts | Cash flow hedges    
Disclosure of financial assets [line items]    
Fair value 8 2
Financial liabilities, at fair value (3) (19)
Other Derivative Contracts    
Disclosure of financial assets [line items]    
Fair value 168 89
Financial liabilities, at fair value (57) (11)
Other Derivative Contracts | Derivative investments    
Disclosure of financial assets [line items]    
Fair value 125 72
Financial liabilities, at fair value (57) (11)
Other Derivative Contracts | Cash flow hedges    
Disclosure of financial assets [line items]    
Fair value 43 17
Financial liabilities, at fair value $ 0 $ 0