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Financial Instrument Risk Management - Derivative Financial Instruments by Counterparty 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
Derivative assets    
Disclosure of external credit grades [line items]    
Financial assets 1,112 1,478
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost    
Disclosure of external credit grades [line items]    
Financial assets 1,085 1,451
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | AA    
Disclosure of external credit grades [line items]    
Financial assets 289 113
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | A    
Disclosure of external credit grades [line items]    
Financial assets 750 872
Derivative assets | Over-the-counter derivative contracts | Credit risk | Gross positive replacement cost | BBB    
Disclosure of external credit grades [line items]    
Financial assets 46 466
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements    
Disclosure of external credit grades [line items]    
Financial assets (768) (694)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | AA    
Disclosure of external credit grades [line items]    
Financial assets (252) (95)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | A    
Disclosure of external credit grades [line items]    
Financial assets (507) (589)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Impact of master netting agreements | BBB    
Disclosure of external credit grades [line items]    
Financial assets (9) (10)
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost    
Disclosure of external credit grades [line items]    
Financial assets 317 757
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost | AA    
Disclosure of external credit grades [line items]    
Financial assets 37 18
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost | A    
Disclosure of external credit grades [line items]    
Financial assets 243 283
Derivative assets | Over-the-counter derivative contracts | Credit risk | Net replacement cost | BBB    
Disclosure of external credit grades [line items]    
Financial assets 37 456
Derivative assets | Exchange-traded derivative contracts    
Disclosure of external credit grades [line items]    
Financial assets $ 27 $ 27