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Financial Instrument Risk Management - Debt Securities by Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of external credit grades [line items]    
Financial assets $ 143,061 $ 137,691
Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 74,443 72,619
Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 15,647 13,449
Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 16,252 15,815
Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 21,536 22,603
Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 20,129 19,568
Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 879 1,184
Fair value through profit or loss | Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 61,402 59,967
Fair value through profit or loss | Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 9,728 8,579
Fair value through profit or loss | Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 14,208 14,006
Fair value through profit or loss | Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 19,089 19,603
Fair value through profit or loss | Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 17,646 16,894
Fair value through profit or loss | Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets 731 885
Available-for-sale | Debt securities | Credit risk    
Disclosure of external credit grades [line items]    
Financial assets 13,041 12,652
Available-for-sale | Debt securities | Credit risk | AAA    
Disclosure of external credit grades [line items]    
Financial assets 5,919 4,870
Available-for-sale | Debt securities | Credit risk | AA    
Disclosure of external credit grades [line items]    
Financial assets 2,044 1,809
Available-for-sale | Debt securities | Credit risk | A    
Disclosure of external credit grades [line items]    
Financial assets 2,447 3,000
Available-for-sale | Debt securities | Credit risk | BBB    
Disclosure of external credit grades [line items]    
Financial assets 2,483 2,674
Available-for-sale | Debt securities | Credit risk | BB and lower    
Disclosure of external credit grades [line items]    
Financial assets $ 148 $ 299