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Capital Management - Schedule of Total Capital (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Entity Location [Line Items]        
Borrowings $ 6,178   $ 6,676  
Equity 24,200   22,887 $ 22,206
Previously stated        
Entity Location [Line Items]        
Equity       28,073
Subordinated debt        
Entity Location [Line Items]        
Borrowings 6,178 $ 6,676    
Total capital 42,364 40,628    
Subordinated debt | Previously stated        
Entity Location [Line Items]        
Borrowings     6,676  
Total capital     36,253  
Innovative capital instruments        
Entity Location [Line Items]        
Borrowings 200 200    
Innovative capital instruments | Previously stated        
Entity Location [Line Items]        
Borrowings     200  
Shares        
Entity Location [Line Items]        
Equity 21,343 20,290    
Shares | Previously stated        
Entity Location [Line Items]        
Equity     25,211  
Participating account        
Entity Location [Line Items]        
Equity 457 268 268  
Participating account | Previously stated        
Entity Location [Line Items]        
Equity     1,837 1,700
Non-controlling interests        
Entity Location [Line Items]        
Equity 161 90 90 $ 59
Contractual Service Margin 11,786 10,865    
Non-controlling interests | Previously stated        
Entity Location [Line Items]        
Equity     90  
Preferred shares | Shares        
Entity Location [Line Items]        
Equity $ 2,239 $ 2,239 2,239  
Preferred shares | Shares | Previously stated        
Entity Location [Line Items]        
Equity     $ 2,239