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Stock-Based Compensation - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
May 06, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense   $ 39   $ 18 $ 73 $ 32  
Dividends declared per share   $ 0.8300   $ 0.6500 $ 1.4800 $ 1.2125  
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of options issued (shares)         222,894    
Weighted average grant price (per share)         $ 272.33    
Expiration period         7 years    
Grant date fair value, options         $ 14    
Dividends declared per share $ 0.8300            
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         131,844    
PSU payout percentage             177.00%
Number of trading days             30 days
PSU 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         132,423    
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         15,179    
Grant date fair value, other than options         $ 4