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Stock-Based Compensation - Narrative (Details) - CAD
CAD / shares in Units, CAD in Millions
3 Months Ended 6 Months Ended 12 Months Ended
May 10, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]              
Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Expected Dividends Per Share CAD 0.5625     CAD 2.0010      
Stock-based compensation expense   CAD 17 CAD 1 CAD 5 CAD 15    
Number of options issued (shares)       369,980      
Weighted average of options issued (in CAD per share)       CAD 45.78      
Scenario, Forecast [Member]              
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]              
Share Based Compensation Arrangement By Share Based Payment Award, Fair Value Assumptions, Expected Dividends Per Share           CAD 2.2500  
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 199.08      
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)       134,991      
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)       17,110      
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