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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, 2017
Mar. 31, 2016
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Stock-based compensation expense CAD (12) CAD 14  
Number of options issued (shares) 366,930    
Weighted average of options issued (in CAD per share) CAD 45.78    
Chief Executive Officer [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Forfeited stock options 752,145    
Compensation and benefits CAD (51)    
Pension benefits CAD (27)    
Stock Options [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Weighted average of options issued (in CAD per share) CAD 198.98    
Expiration period 7 years    
Grant price CAD 17    
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 60 months    
Performance Shares [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Units issued (shares) 133,448    
Grant date fair value CAD 27    
PSU payout threshold     118.00%
PSU payout CAD 31    
Number of PSUs exercised (shares) 133,728    
Number of trading days     30 days
Performance Shares [Member] | Chief Executive Officer [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Forfeited cash settled awards 22,514    
Deferred Share Units [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Vesting period 48 months    
Company granted DSUs (shares) 14,055    
Grant date fair value CAD 3    
Deferred Share Units [Member] | Chief Executive Officer [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Forfeited cash settled awards 68,612