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Equity-based compensation - Narrative (Details)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
shares
$ / shares
Dec. 31, 2024
USD ($)
shares
$ / shares
Dec. 31, 2023
USD ($)
shares
$ / shares
Dec. 31, 2023
USD ($)
shares
$ / shares
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Disclosure of range of exercise prices of outstanding share options [line items]            
Expense from equity-settled share-based payment transactions     $ 25      
Equity-based compensation $ 14   25      
Exercised (in CAD per share) | $ / shares   $ 69.42   $ 59.81    
Ordinary shares            
Disclosure of range of exercise prices of outstanding share options [line items]            
Number of shares authorised | shares 8,295,940 8,295,940     8,295,940  
Number of share options available remaining for issuance | shares 623,431          
Equity-based compensation $ 6   11      
Share-based payment arrangements, vesting rate 20.00%          
Share-based payment arrangements, vesting period 10 years          
Exercised (in CAD per share) | $ / shares   $ 123.05   $ 107.45    
Liabilities from share-based payment transactions $ 21 $ 21 $ 30 $ 30    
Weighted average share price, share options granted | (per share) $ 30.04 $ 43.23 $ 34.21 $ 46.17    
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested $ 10 $ 10 $ 16 $ 16 $ 14 $ 22
Phantom Share Unit            
Disclosure of range of exercise prices of outstanding share options [line items]            
Equity-based compensation $ 7   $ 12      
Share-based payment arrangements, vesting period 3 years          
Performance Share Units            
Disclosure of range of exercise prices of outstanding share options [line items]            
Number of other equity instruments outstanding in share-based payment arrangement | shares 168,775 168,775 179,757 179,757 168,775 179,757
Deferred Share Unit            
Disclosure of range of exercise prices of outstanding share options [line items]            
Equity-based compensation     $ 2      
Recovery of expense from share-based payment transactions $ 2          
Number of other equity instruments outstanding in share-based payment arrangement | shares 91,450 91,450 78,895 78,895 91,450 78,895