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Financial Instrument Risk Management - Credit Default Swaps by Underlying Financial Instrument 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
Financial assets, at fair value 144,673 140,292
Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 1,356 1,121
Financial assets, at fair value 23 25
Single name CDS contracts | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 1,333 1,097
Financial assets, at fair value 23 25
Single name CDS contracts | AA | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 48 67
Financial assets, at fair value 1 1
Single name CDS contracts | A | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 611 584
Financial assets, at fair value 9 15
Single name CDS contracts | BBB | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 674 446
Financial assets, at fair value 13 9
CDS index contracts | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 23 24
Financial assets, at fair value $ 0 $ 0