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Share-Based Payment Plans (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2019
CAD ($)
shares
$ / shares
Dec. 31, 2018
CAD ($)
shares
Feb. 29, 2016
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets   $ 25,000,000    
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets   24,000,000    
Cumulative change in compensation expense   1,000,000    
Executive officers        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of share options granted (in shares) | shares 0.7      
Weighted average exercise price of share options granted in share-based payment arrangement $ 9.17 $ 5.65 $ 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      
Par value per share | $ / shares   $ 8.29    
Compensation expense (reversal) $ 15,000,000 $ 19,000,000 8,000,000  
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) $ 1,000,000 2,000,000 0  
Stock Options        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of shares authorized (in shares) | shares       16.5
Stock Options | Executive officers        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 3 years      
Compensation expense (reversal) $ 2,000,000 $ 1,000,000 $ 1,000,000  
Number of share options granted (in shares) | shares   1.4 0.7