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Financial Instrument Risk Management - Credit Risk Exposure By Internal Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [line items]      
Notional amount $ 162,948 $ 157,035 $ 174,499
Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 54,600 $ 51,253  
Less: Total allowance for ECL 57    
Mortgages and loans | Performing - Stage 1      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 8    
Mortgages and loans | Performing - Stage 2      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 0    
Mortgages and loans | Impaired - Stage 3      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 49    
Debt securities      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 32    
Debt securities | Performing - Stage 1      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 30    
Debt securities | Performing - Stage 2      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 2    
Debt securities | Impaired - Stage 3      
Disclosure of credit risk exposure [line items]      
Less: Total allowance for ECL 0    
Amortized cost | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 2,111    
Less: Total allowance for ECL 11    
Total mortgages and loans at amortized cost, net of total allowance for ECL 2,100    
Amortized cost | Mortgages and loans | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 2,071    
Amortized cost | Mortgages and loans | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 25    
Amortized cost | Mortgages and loans | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 15    
Amortized cost | Mortgages and loans | Performing - Stage 1      
Disclosure of credit risk exposure [line items]      
Notional amount 2,046    
Less: Total allowance for ECL 1    
Total mortgages and loans at amortized cost, net of total allowance for ECL 2,045    
Amortized cost | Mortgages and loans | Performing - Stage 1 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 2,046    
Amortized cost | Mortgages and loans | Performing - Stage 1 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Amortized cost | Mortgages and loans | Performing - Stage 1 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Amortized cost | Mortgages and loans | Performing - Stage 2      
Disclosure of credit risk exposure [line items]      
Notional amount 50    
Less: Total allowance for ECL 0    
Total mortgages and loans at amortized cost, net of total allowance for ECL 50    
Amortized cost | Mortgages and loans | Performing - Stage 2 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 25    
Amortized cost | Mortgages and loans | Performing - Stage 2 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 25    
Amortized cost | Mortgages and loans | Performing - Stage 2 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Amortized cost | Mortgages and loans | Impaired - Stage 3      
Disclosure of credit risk exposure [line items]      
Notional amount 15    
Less: Total allowance for ECL 10    
Total mortgages and loans at amortized cost, net of total allowance for ECL 5    
Amortized cost | Mortgages and loans | Impaired - Stage 3 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Amortized cost | Mortgages and loans | Impaired - Stage 3 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Amortized cost | Mortgages and loans | Impaired - Stage 3 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 15    
FVOCI | Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 1,948    
FVOCI | Mortgages and loans | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 1,818    
FVOCI | Mortgages and loans | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 128    
FVOCI | Mortgages and loans | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 2    
FVOCI | Mortgages and loans | Performing - Stage 1      
Disclosure of credit risk exposure [line items]      
Notional amount 1,889    
FVOCI | Mortgages and loans | Performing - Stage 1 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 1,806    
FVOCI | Mortgages and loans | Performing - Stage 1 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 83    
FVOCI | Mortgages and loans | Performing - Stage 1 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Mortgages and loans | Performing - Stage 2      
Disclosure of credit risk exposure [line items]      
Notional amount 57    
FVOCI | Mortgages and loans | Performing - Stage 2 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 12    
FVOCI | Mortgages and loans | Performing - Stage 2 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 45    
FVOCI | Mortgages and loans | Performing - Stage 2 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Mortgages and loans | Impaired - Stage 3      
Disclosure of credit risk exposure [line items]      
Notional amount 2    
FVOCI | Mortgages and loans | Impaired - Stage 3 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Mortgages and loans | Impaired - Stage 3 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Mortgages and loans | Impaired - Stage 3 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 2    
FVOCI | Debt securities      
Disclosure of credit risk exposure [line items]      
Notional amount 14,313    
FVOCI | Debt securities | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 13,888    
FVOCI | Debt securities | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 425    
FVOCI | Debt securities | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Debt securities | Performing - Stage 1      
Disclosure of credit risk exposure [line items]      
Notional amount 14,223    
FVOCI | Debt securities | Performing - Stage 1 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 13,834    
FVOCI | Debt securities | Performing - Stage 1 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 389    
FVOCI | Debt securities | Performing - Stage 1 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Debt securities | Performing - Stage 2      
Disclosure of credit risk exposure [line items]      
Notional amount 90    
FVOCI | Debt securities | Performing - Stage 2 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 54    
FVOCI | Debt securities | Performing - Stage 2 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 36    
FVOCI | Debt securities | Performing - Stage 2 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Debt securities | Impaired - Stage 3      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Debt securities | Impaired - Stage 3 | Investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Debt securities | Impaired - Stage 3 | Non-investment grade      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
FVOCI | Debt securities | Impaired - Stage 3 | Impaired      
Disclosure of credit risk exposure [line items]      
Notional amount $ 0