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Stock-based compensation (Options Range of exercise prices) (Details 7)
CAD / shares in Units, shares in Millions, CAD in Millions
12 Months Ended
Dec. 31, 2015
CAD
CAD / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Entity's closing stock price at end of period CAD 77.35
Options Outstanding [Abstract]  
Number of options outstanding | shares 5.9
Weighted-average years to expiration of options outstanding 6 years 1 month
Weighted average exercise price of options outstanding CAD 53.43
Aggregate intrinsic value of options outstanding | CAD CAD 151
Options Exercisable [Abstract]  
Number of exercisable options | shares 3.6
Weighted average exercise price of exercisable options CAD 41.74
Aggregate intrinsic value of exercisable options | CAD CAD 127
Weighted-average years to expiration of exercisable options (years) 4 years 10 months
Range of Exercise Prices 1 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum price of options outstanding, end of the period CAD 20.95
Maximum price of options outstanding, end of the period CAD 31.09
Options Outstanding [Abstract]  
Number of options outstanding | shares 0.9
Weighted-average years to expiration of options outstanding 2 years 10 months
Weighted average exercise price of options outstanding CAD 24.54
Aggregate intrinsic value of options outstanding | CAD CAD 48
Options Exercisable [Abstract]  
Number of exercisable options | shares 0.9
Weighted average exercise price of exercisable options CAD 24.54
Aggregate intrinsic value of exercisable options | CAD CAD 48
Range of Exercise Prices 2 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum price of options outstanding, end of the period CAD 31.1
Maximum price of options outstanding, end of the period CAD 47.85
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.4
Weighted-average years to expiration of options outstanding 5 years
Weighted average exercise price of options outstanding CAD 38.13
Aggregate intrinsic value of options outstanding | CAD CAD 56
Options Exercisable [Abstract]  
Number of exercisable options | shares 1.2
Weighted average exercise price of exercisable options CAD 36.75
Aggregate intrinsic value of exercisable options | CAD CAD 47
Range of Exercise Prices 3 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum price of options outstanding, end of the period CAD 47.86
Maximum price of options outstanding, end of the period CAD 58.71
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.5
Weighted-average years to expiration of options outstanding 6 years 2 months
Weighted average exercise price of options outstanding CAD 52.48
Aggregate intrinsic value of options outstanding | CAD CAD 37
Options Exercisable [Abstract]  
Number of exercisable options | shares 1.1
Weighted average exercise price of exercisable options CAD 50.81
Aggregate intrinsic value of exercisable options | CAD CAD 28
Range of Exercise Prices 4 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum price of options outstanding, end of the period CAD 58.72
Maximum price of options outstanding, end of the period CAD 80.87
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.2
Weighted-average years to expiration of options outstanding 7 years 7 months
Weighted average exercise price of options outstanding CAD 69.46
Aggregate intrinsic value of options outstanding | CAD CAD 10
Options Exercisable [Abstract]  
Number of exercisable options | shares 0.4
Weighted average exercise price of exercisable options CAD 68.09
Aggregate intrinsic value of exercisable options | CAD CAD 4
Range of Exercise Prices 5 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum price of options outstanding, end of the period CAD 80.88
Maximum price of options outstanding, end of the period CAD 95.62
Options Outstanding [Abstract]  
Number of options outstanding | shares 0.9
Weighted-average years to expiration of options outstanding 9 years 1 month
Weighted average exercise price of options outstanding CAD 89.63
Aggregate intrinsic value of options outstanding | CAD CAD 0
Options Exercisable [Abstract]  
Number of exercisable options | shares 0.0
Weighted average exercise price of exercisable options CAD 95.62
Aggregate intrinsic value of exercisable options | CAD CAD 0