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Financial Instrument Risk Management - Credit Default Swaps by Underlying Financial Instrument Credit Rating (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of external credit grades [line items]    
Financial assets $ 168,785 $ 152,785
Financial assets, at fair value 175,070 156,591
Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 912 1,227
Financial assets, at fair value 17 29
Single name credit default swap contracts: | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 912 1,227
Financial assets, at fair value 17 29
Single name credit default swap contracts: | AA | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 38 45
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 325 574
Financial assets, at fair value 4 9
Single name credit default swap contracts: | BBB | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 530 608
Financial assets, at fair value 12 19
Single name credit default swap contracts: | BB | Credit default swap contract    
Disclosure of external credit grades [line items]    
Financial assets 19 0
Financial assets, at fair value $ 0 $ 0