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Stock-Based Compensation - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 15   $ 28 $ 88 $ 60  
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options issued (shares)       224,730    
Weighted average grant price       $ 272.66    
Expiration period       7 years    
Grant date fair value, options       $ 14    
Stock Options | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       12 months    
Stock Options | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       48 months    
Performance Share Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units issued       133,681    
PSU payout percentage           177.00%
Number of trading days           30 days
PSU cash payout   $ 54        
Units vested in the period   117,228        
Performance Share Units (PSUs) | Regular and Retention Grant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Units issued       134,260    
Grant date fair value, other than options       $ 36    
Performance Share Units (PSUs) | Retention Grant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units issued       579    
Deferred Share Units (DSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       48 months    
Units issued       17,653    
Grant date fair value, other than options       $ 5