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Financial Instruments And Risk Management - Financial Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives    
Financial Assets Offsetting    
Gross Assets $ 1,599 $ 1,126
Gross Liabilities Offset (1,384) (1,052)
Net Amounts Presented 215 74
Trade receivables    
Financial Assets Offsetting    
Gross Assets 1,837 2,405
Gross Liabilities Offset (882) (1,252)
Net Amounts Presented 955 1,153
Financial assets    
Financial Assets Offsetting    
Gross Assets 3,436 3,531
Gross Liabilities Offset (2,266) (2,304)
Net Amounts Presented $ 1,170 $ 1,227