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Income taxes (Details 5) - CAD
CAD in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation for unrecognized tax benefits for Domestic and Foreign tax positions: [Roll Forward]      
Gross unrecognized tax benefits as at beginning of year CAD 35 CAD 30 CAD 36
Increases for: [Abstract]      
Tax positions related to the current year 4 3 2
Tax positions related to prior years 8 3 4
Decreases for: [Abstract]      
Tax positions related to prior years 0 0 (4)
Settlements (14) 0 (8)
Lapse of the applicable statute of limitations (6) (1) 0
Gross unrecognized tax benefits at end of year 27 35 30
Adjustments to reflect tax treaties and other arrangements (8) (6) (5)
Net unrecognized tax benefits at end of year CAD 19 CAD 29 CAD 25