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Financial Instrument Risk Management - Mortgages and Loans by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of external credit grades [line items]      
Carrying value $ 162,948 $ 157,035 $ 174,499
Mortgages      
Disclosure of external credit grades [line items]      
Carrying value 14,145 14,421  
Mortgages | Credit risk      
Disclosure of external credit grades [line items]      
Carrying value   14,421  
Mortgages | Credit risk | Insured      
Disclosure of external credit grades [line items]      
Carrying value   4,035  
Mortgages | Credit risk | AAA      
Disclosure of external credit grades [line items]      
Carrying value   0  
Mortgages | Credit risk | AA      
Disclosure of external credit grades [line items]      
Carrying value   1,665  
Mortgages | Credit risk | A      
Disclosure of external credit grades [line items]      
Carrying value   5,483  
Mortgages | Credit risk | BBB      
Disclosure of external credit grades [line items]      
Carrying value   2,686  
Mortgages | Credit risk | BB and lower      
Disclosure of external credit grades [line items]      
Carrying value   538  
Mortgages | Credit risk | Impaired      
Disclosure of external credit grades [line items]      
Carrying value   14  
Loans      
Disclosure of external credit grades [line items]      
Carrying value $ 40,455 36,832  
Loans | Credit risk      
Disclosure of external credit grades [line items]      
Carrying value   36,832  
Loans | Credit risk | AAA      
Disclosure of external credit grades [line items]      
Carrying value   285  
Loans | Credit risk | AA      
Disclosure of external credit grades [line items]      
Carrying value   5,101  
Loans | Credit risk | A      
Disclosure of external credit grades [line items]      
Carrying value   15,257  
Loans | Credit risk | BBB      
Disclosure of external credit grades [line items]      
Carrying value   14,284  
Loans | Credit risk | BB and lower      
Disclosure of external credit grades [line items]      
Carrying value   1,872  
Loans | Credit risk | Impaired      
Disclosure of external credit grades [line items]      
Carrying value   $ 33