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Financial Instruments Inception Gains And Losses (Details) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss [abstract]      
Unamortized net gain at beginning of year CAD 148 CAD 202 CAD 188
New inception gains 12 10 28
Change in foreign exchange rates (7) (4) 28
Amortization recorded in net earnings during the year (48) (60) (42)
Unamortized net gain at end of year CAD 105 CAD 148 CAD 202