XML 196 R168.htm IDEA: XBRL DOCUMENT v3.10.0.1
Share-Based Payment Plans (Details)
shares in Millions
 1 Months Ended 12 Months Ended
Feb. 29, 2016
CAD ($)
shares
Mar. 31, 2017
CAD ($)
shares
Feb. 29, 2016
CAD ($)
shares
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Executive officers            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of share options granted (in shares) | shares 1.1   0.7      
Exercise price of share options granted (in dollars per share) $ 5.93   $ 7.45      
PSUs and RSUs            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance period       3 years    
Vesting period       3 years    
Compensation expense (reversal)       $ 8,000,000 $ 15,000,000 $ 17,000,000
PSUs            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Performance period       3 years    
RSUs            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period       3 years    
DSUs            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Compensation expense (reversal)       $ 0 $ 1,000,000 $ 3,000,000
Stock Options            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of shares authorized (in shares) | shares 13.0   13.0      
Stock Options | Executive officers            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period 3 years 3 years     3 years  
Compensation expense (reversal)   $ 1,000,000 $ 1,000,000 $ 1,000,000    
Number of share options granted (in shares) | shares   0.7        
Exercise price of share options granted (in dollars per share)   $ 7.25        
Expiration period of shares granted 7 years 7 years 7 years      
Employee Share Purchase Plan | Non-executive employees            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Maximum amount of interest fee loan as percent of employee salary (as percent)       30.00%    
Repayment period       3 years    
Amount receivable from employees       $ 0 $ 1,000,000