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Financial Instrument Risk Management - Past Due and Impaired Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2021
Disclosure of credit risk exposure [line items]      
Notional amount $ 157,035 $ 162,948 $ 174,499
Mortgages and loans      
Disclosure of credit risk exposure [line items]      
Notional amount 51,253 54,600  
Mortgages and loans | Gross carrying value | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 56,453    
Mortgages and loans | Gross carrying value | Not past due | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 56,228    
Mortgages and loans | Gross carrying value | Impaired | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 225    
Mortgages and loans | Allowance for losses | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 192    
Mortgages and loans | Allowance for losses | Not past due | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Mortgages and loans | Allowance for losses | Impaired | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 192    
Mortgages      
Disclosure of credit risk exposure [line items]      
Notional amount 14,421 14,145  
Mortgages | Gross carrying value      
Disclosure of credit risk exposure [line items]      
Notional amount 14,421 14,146  
Mortgages | Gross carrying value | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 15,440    
Mortgages | Gross carrying value | Not past due | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 15,360    
Mortgages | Gross carrying value | Impaired | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 80    
Mortgages | Allowance for losses | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 80    
Mortgages | Allowance for losses | Not past due | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Mortgages | Allowance for losses | Impaired | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 80    
Loans      
Disclosure of credit risk exposure [line items]      
Notional amount 36,832 40,455  
Loans | Gross carrying value      
Disclosure of credit risk exposure [line items]      
Notional amount 36,832 $ 40,465  
Loans | Gross carrying value | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 41,013    
Loans | Gross carrying value | Not past due | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 40,868    
Loans | Gross carrying value | Impaired | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 145    
Loans | Allowance for losses | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 112    
Loans | Allowance for losses | Not past due | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 0    
Loans | Allowance for losses | Impaired | Previously stated      
Disclosure of credit risk exposure [line items]      
Notional amount 112    
FVOCI      
Disclosure of credit risk exposure [line items]      
Impairment loss (reversal of impairment loss) recognised in profit or loss $ 8