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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, 2016
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 90.36
Options Outstanding [Abstract]  
Number of options outstanding | shares 5.3
Weighted-average years to expiration of options outstanding 6 years 6 months
Weighted average exercise price of options outstanding CAD 61.07
Aggregate intrinsic value of options outstanding | CAD CAD 156
Options Exercisable [Abstract]  
Number of exercisable options | shares 2.9
Weighted average exercise price of exercisable options CAD 49.91
Aggregate intrinsic value of exercisable options | CAD CAD 117
Weighted-average years to expiration of exercisable options (years) 5 years
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 32.28
Options Outstanding [Abstract]  
Number of options outstanding | shares 0.5
Weighted-average years to expiration of options outstanding 2 years 1 month
Weighted average exercise price of options outstanding CAD 24.54
Aggregate intrinsic value of options outstanding | CAD CAD 30
Options Exercisable [Abstract]  
Number of exercisable options | shares 0.5
Weighted average exercise price of exercisable options CAD 24.54
Aggregate intrinsic value of exercisable options | CAD CAD 30
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 32.29
Maximum price of options outstanding, end of the period CAD 49.84
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.1
Weighted-average years to expiration of options outstanding 4 years 8 months
Weighted average exercise price of options outstanding CAD 42.73
Aggregate intrinsic value of options outstanding | CAD CAD 51
Options Exercisable [Abstract]  
Number of exercisable options | shares 1.0
Weighted average exercise price of exercisable options CAD 42.34
Aggregate intrinsic value of exercisable options | CAD CAD 48
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 49.85
Maximum price of options outstanding, end of the period CAD 67.12
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.3
Weighted-average years to expiration of options outstanding 5 years 11 months
Weighted average exercise price of options outstanding CAD 57.56
Aggregate intrinsic value of options outstanding | CAD CAD 43
Options Exercisable [Abstract]  
Number of exercisable options | shares 1.0
Weighted average exercise price of exercisable options CAD 56.54
Aggregate intrinsic value of exercisable options | CAD CAD 34
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 67.13
Maximum price of options outstanding, end of the period CAD 74
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.1
Weighted-average years to expiration of options outstanding 8 years 2 months
Weighted average exercise price of options outstanding CAD 70.93
Aggregate intrinsic value of options outstanding | CAD CAD 23
Options Exercisable [Abstract]  
Number of exercisable options | shares 0.2
Weighted average exercise price of exercisable options CAD 71.08
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 74.01
Maximum price of options outstanding, end of the period CAD 92.77
Options Outstanding [Abstract]  
Number of options outstanding | shares 1.3
Weighted-average years to expiration of options outstanding 8 years 6 months
Weighted average exercise price of options outstanding CAD 83.82
Aggregate intrinsic value of options outstanding | CAD CAD 9
Options Exercisable [Abstract]  
Number of exercisable options | shares 0.2
Weighted average exercise price of exercisable options CAD 87.8
Aggregate intrinsic value of exercisable options | CAD CAD 1