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Stock-based compensation - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Dec. 31, 2022
CAD ($)
shares
Dec. 31, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 108 $ 122 $ 113  
Stock based compensation expense, tax benefit $ 26 27 26  
Vesting period 1 year      
Share-based liabilities paid $ 64 89 137  
Regular and Performance Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 24 25 23  
Expiration period 7 years      
Fair value of options at grant date $ 27 26 16  
Unrecognized compensation expense $ 10      
Weighted-average period of recognition for unrecognized compensation 1 year 1 month 6 days      
Fair value of shares vested for stock option plan $ 20 18 $ 24  
Regular and Performance Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 12 months      
Regular and Performance Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 48 months      
PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares 568,159   415,660 431,430
Grant date fair value $ 65      
Share-based liabilities paid $ 54 86 $ 116  
Performance Deferred Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares 25,589   13,506 12,694
Grant date fair value $ 3      
Matching % of DSU's granted to senior managers 25.00%      
PSUs and PDSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 72 $ 78 $ 69  
Unrecognized compensation expense $ 49      
Weighted-average period of recognition for unrecognized compensation 1 year 6 months      
Granted (in shares) | shares 593,748 917,744    
PSUs and PDSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
PSUs and PDSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
DSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1 $ 10 10  
Vesting period 36 months      
Unrecognized compensation expense $ 1      
Weighted-average period of recognition for unrecognized compensation 1 year 10 months 24 days      
Granted (in shares) | shares 71,082 85,750    
Grant date fair value $ 8      
Matching % of DSU's granted to senior managers 25.00%      
Number of trading days 10 days      
Share-based liabilities paid $ 9 $ 2 16  
Ownership target period 5 years      
Employee Share Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 12 $ 11 $ 9  
Vesting period 1 year      
Maximum percentage of annual salary that an employee can contribute 6.00%      
Number of shares purchased on behalf of participants | shares 746,544 600,730 566,902  
Employer contributions $ 17 $ 15 $ 11  
Employer matching ratio per dollar contributed 0.3333      
Performance Shares, Initial Group        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares   544,175    
Performance Shares, Remaining        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) | shares   347,236    
Share-based Payment Arrangement, Tranche One | PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Payout percentage 120.00% 135.00%    
PSUs vested in period (in shares) | shares 381,760 399,372    
Fair value of PSUs vested in period $ 49 $ 54    
Number of trading days 30 days      
Share-based Payment Arrangement, Tranche One | Performance Deferred Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
PSUs vested in period (in shares) | shares 9,774 11,372    
Fair value of PSUs vested in period $ 2 $ 2