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Shareholders' equity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
vote
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Class of Stock [Line Items]      
Number of votes per share of common stock | vote 1    
Dividends, preferred stock | $ $ 1 $ 1 $ 1
Common stock repurchased (in shares) 15,872,321 54,900,928  
Common stock repurchased, percentage of issued capital 2.21% 7.47%  
Common stock repurchased, average price (in usd per share) | $ / shares $ 82.01 $ 54.92  
Common stock cancelled (in shares)   17,620,740  
Common stock cancelled, percentage of issued capital   2.40%  
Treasury stock (in shares) 41,355,384 42,419,281  
Treasury stock, percentage of common stock issued 5.75% 5.78%  
5% Preferred Stock      
Class of Stock [Line Items]      
Preferred stock dividend rate percentage 5.00%    
Preferred stock issued as a percentage of total issued share capital 0.03% 0.03%  
7% Preferred Stock      
Class of Stock [Line Items]      
Preferred stock dividend rate percentage 7.00%    
Preferred stock issued as a percentage of total issued share capital 0.48% 0.47%