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Stock-based Compensation (Options Outstanding and Exercisable) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
CAD ($)
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Closing stock price (in dollars per share) $ 101.11
Options Outstanding  
Number of options outstanding (in shares) | shares 4.2
Weighted-average years to expiration of options outstanding 6 years 8 months 12 days
Weighted average exercise price of options outstanding (in dollars per share) $ 79.73
Aggregate intrinsic value of options outstanding | $ $ 94
Options Exercisable  
Number of options exercisable (in shares) | shares 1.9
Weighted average exercise price of options exercisable (in dollars per share) $ 63.91
Aggregate intrinsic value of options exercisable | $ $ 71
Weighted-average years to expiration of options exercisable 5 years
Range of Exercise Prices 1 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Floor of exercise price range (in dollars per share) $ 20.96
Ceiling of exercise price range (in dollars per share) $ 45.00
Options Outstanding  
Number of options outstanding (in shares) | shares 0.4
Weighted-average years to expiration of options outstanding 1 year 10 months 24 days
Weighted average exercise price of options outstanding (in dollars per share) $ 32.98
Aggregate intrinsic value of options outstanding | $ $ 26
Options Exercisable  
Number of options exercisable (in shares) | shares 0.4
Weighted average exercise price of options exercisable (in dollars per share) $ 32.98
Aggregate intrinsic value of options exercisable | $ $ 26
Range of Exercise Prices 2 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Floor of exercise price range (in dollars per share) $ 45.01
Ceiling of exercise price range (in dollars per share) $ 65.00
Options Outstanding  
Number of options outstanding (in shares) | shares 0.5
Weighted-average years to expiration of options outstanding 4 years 2 months 12 days
Weighted average exercise price of options outstanding (in dollars per share) $ 55.85
Aggregate intrinsic value of options outstanding | $ $ 26
Options Exercisable  
Number of options exercisable (in shares) | shares 0.5
Weighted average exercise price of options exercisable (in dollars per share) $ 55.85
Aggregate intrinsic value of options exercisable | $ $ 26
Range of Exercise Prices 3 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Floor of exercise price range (in dollars per share) $ 65.01
Ceiling of exercise price range (in dollars per share) $ 85.00
Options Outstanding  
Number of options outstanding (in shares) | shares 1.2
Weighted-average years to expiration of options outstanding 6 years 7 months 6 days
Weighted average exercise price of options outstanding (in dollars per share) $ 75.20
Aggregate intrinsic value of options outstanding | $ $ 31
Options Exercisable  
Number of options exercisable (in shares) | shares 0.7
Weighted average exercise price of options exercisable (in dollars per share) $ 75.82
Aggregate intrinsic value of options exercisable | $ $ 17
Range of Exercise Prices 4 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Floor of exercise price range (in dollars per share) $ 85.01
Ceiling of exercise price range (in dollars per share) $ 105.00
Options Outstanding  
Number of options outstanding (in shares) | shares 1.6
Weighted-average years to expiration of options outstanding 8 years
Weighted average exercise price of options outstanding (in dollars per share) $ 94.44
Aggregate intrinsic value of options outstanding | $ $ 11
Options Exercisable  
Number of options exercisable (in shares) | shares 0.3
Weighted average exercise price of options exercisable (in dollars per share) $ 92.40
Aggregate intrinsic value of options exercisable | $ $ 2
Range of Exercise Prices 5 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Floor of exercise price range (in dollars per share) $ 105.01
Ceiling of exercise price range (in dollars per share) $ 122.96
Options Outstanding  
Number of options outstanding (in shares) | shares 0.5
Weighted-average years to expiration of options outstanding 9 years 1 month 6 days
Weighted average exercise price of options outstanding (in dollars per share) $ 109.21
Aggregate intrinsic value of options outstanding | $ $ 0
Options Exercisable  
Number of options exercisable (in shares) | shares 0.0
Weighted average exercise price of options exercisable (in dollars per share) $ 108.22
Aggregate intrinsic value of options exercisable | $ $ 0