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Stock-Based Compensation - Narrative (Details) - CAD
CAD / shares in Units, CAD in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Stock-based compensation expense CAD 14 CAD 29  
Number of options issued (shares) 400,590    
Weighted average of options issued (in CAD per share) CAD 38.96    
Stock Options [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Weighted average of options issued (in CAD per share) CAD 165.47    
Expiration period 10 years    
Grant price CAD 16    
Stock Options [Member] | Minimum [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period 12 months    
Stock Options [Member] | Maximum [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period 48 months    
Performance Share Units [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Units issued (shares) 146,520    
Grant date fair value CAD 24    
PSU payout threshold     200.00%
PSU meeting threshold requirements (shares)     300,095
PSU payout CAD 31   CAD 79
Number of PSUs exercised (shares) 83,563   217,179
Number of trading days     30 days
Deferred Share Units [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period 48 months    
Company granted DSUs (shares) 20,739    
Grant date fair value CAD 4