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Financial Instrument Risk Management - Credit Default Swaps by Underlying Financial Instrument Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of external credit grades [line items]    
Financial assets $ 152,785 $ 143,061
Financial assets, at fair value 156,591 144,673
Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 1,227 1,356
Financial assets, at fair value 29 23
Single name credit default swap contracts: | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 1,227 1,333
Financial assets, at fair value 29 23
Single name credit default swap contracts: | AA | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 45 48
Financial assets, at fair value 1 1
Single name credit default swap contracts: | A | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 574 611
Financial assets, at fair value 9 9
Single name credit default swap contracts: | BBB | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 608 674
Financial assets, at fair value 19 13
Credit default swap index contracts | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 0 23
Financial assets, at fair value $ 0 $ 0