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Changes in Accounting Policies - Amendment to IFRS 4 (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items]    
Financial assets $ 143,061 $ 137,691
SPPI | Debt securities | IFRS 4    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 12,900  
SPPI | Mortgages and loans, not supporting insurance contract liabilities | IFRS 4    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 4,400  
SPPI | Mortgages and loans, supporting insurance contract liabilities | IFRS 4    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 43,800  
Non-SPPI | Debt securities | IFRS 4    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 100  
Non-SPPI | Mortgages and loans, not supporting insurance contract liabilities | IFRS 4    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 200  
Non-SPPI | Mortgages and loans, supporting insurance contract liabilities | IFRS 4    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 0  
Debt securities | Credit risk    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 74,443 72,619
Debt securities | Available-for-sale | Credit risk    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 13,041 12,652
Debt securities | Available-for-sale | Credit risk | Below Investment Grade    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 100  
Mortgages and loans    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets 46,822 $ 42,805
Mortgages and loans | Available-for-sale | Credit risk | Below Investment Grade    
Disclosure of initial application of standards or interpretations [line items]    
Financial assets $ 2,100