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Financial Instrument Risk Management - Derivative Financial Instruments by Counterparty 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
Derivative assets    
Disclosure of external credit grades [line items]    
Financial assets 2,160 1,548
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost    
Disclosure of external credit grades [line items]    
Financial assets 2,124 1,529
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | AA    
Disclosure of external credit grades [line items]    
Financial assets 596 439
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | A    
Disclosure of external credit grades [line items]    
Financial assets 1,430 1,008
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | BBB    
Disclosure of external credit grades [line items]    
Financial assets 98 82
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements    
Disclosure of external credit grades [line items]    
Financial assets (883) (737)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | AA    
Disclosure of external credit grades [line items]    
Financial assets (293) (210)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | A    
Disclosure of external credit grades [line items]    
Financial assets (575) (517)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | BBB    
Disclosure of external credit grades [line items]    
Financial assets (15) (10)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost    
Disclosure of external credit grades [line items]    
Financial assets 1,241 792
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost | AA    
Disclosure of external credit grades [line items]    
Financial assets 303 229
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost | A    
Disclosure of external credit grades [line items]    
Financial assets 855 491
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost | BBB    
Disclosure of external credit grades [line items]    
Financial assets 83 72
Derivative assets | Exchange-traded derivative contracts    
Disclosure of external credit grades [line items]    
Financial assets $ 36 $ 19