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Financial Instrument Risk Management - Fair Value of Derivative Instruments (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative assets $ 1,548 $ 1,112
Derivative liabilities (2,040) (2,295)
Measured at fair value    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative liabilities (2,040) (2,295)
Measured at fair value | Under 1 Year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative liabilities (73) (240)
Measured at fair value | 1 to 5 Years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative liabilities (377) (555)
Measured at fair value | Over 5 Years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative liabilities (1,590) (1,500)
Measured at fair value    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative assets 1,548 1,112
Measured at fair value | Under 1 Year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative assets 180 100
Measured at fair value | 1 to 5 Years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative assets 231 150
Measured at fair value | Over 5 Years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative assets $ 1,137 $ 862