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Income taxes (Details 5) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation for unrecognized tax benefits for Domestic and Foreign tax positions: [Roll Forward]      
Gross unrecognized tax benefits at beginning of year CAD 27 CAD 35 CAD 30
Increases for: [Abstract]      
Tax positions related to the current year 16 4 3
Tax positions related to prior years 24 8 3
Decreases for: [Abstract]      
Settlements (2) (14) 0
Lapse of the applicable statute of limitations (4) (6) (1)
Gross unrecognized tax benefits at end of year 61 27 35
Adjustments to reflect tax treaties and other arrangements (7) (8) (6)
Net unrecognized tax benefits at end of year CAD 54 CAD 19 CAD 29