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Financial Instrument Risk Management - Risk Sensitivities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Disclosure of credit risk exposure [line items]    
Impact of re-balancing equity hedges, 10% change in equity markets 0.02  
Impact of re-balancing equity hedges, 10% change in equity markets 0.05  
Increments of rounding $ 25  
Impact of re-balancing interest rate hedges, 50bps change in interest rates 0.0010  
25% decrease | Equity price risk    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic $ (400) $ (300)
10% decrease | Equity price risk    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (175) (125)
10% decrease | Real estate sensitivities    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (475) (500)
10% increase | Equity price risk    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 175 125
10% increase | Real estate sensitivities    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 475 500
25% increase | Equity price risk    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 425 325
50 basis point decrease | Interest rate risk | FVTPL    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (25) (100)
50 basis point decrease | Interest rate risk | FVOCI    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 200 225
50 basis point decrease | Credit risk | FVTPL    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 50 50
50 basis point decrease | Credit risk | FVOCI    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 200 200
50 basis point increase | Interest rate risk | FVTPL    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic 50 75
50 basis point increase | Interest rate risk | FVOCI    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (200) (225)
50 basis point increase | Credit risk | FVTPL    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (50) (50)
50 basis point increase | Credit risk | FVOCI    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (175) (200)
20 basis point decrease | Swap spread sensitivities | FVTPL    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic (25) (25)
20 basis point increase | Swap spread sensitivities | FVTPL    
Disclosure of credit risk exposure [line items]    
Risk exposure associated with instruments sharing characteristic $ 25 $ 25