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Shareholders' equity (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 02, 2023
USD ($)
Dec. 31, 2023
USD ($)
vote
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Class of Stock [Line Items]        
Number of votes per share of common stock | vote   1    
Dividends, preferred stock | $   $ 1 $ 1 $ 1
Share buyback program, authorized amount | $ $ 3,000      
Share buyback program, term 12 months      
Common stock repurchased (in shares)   54,900,928 29,755,861  
Common stock repurchased, percentage of issued capital   7.47% 3.96%  
Common stock repurchased, average price (in usd per share) | $ / shares   $ 54.92 $ 39.22  
Common stock cancelled (in shares)   17,620,740 22,000,000  
Common stock cancelled, percentage of issued capital   2.40% 2.92%  
Treasury stock (in shares)   42,419,281 7,712,885  
Treasury stock, percentage of common stock issued   5.78% 1.03%  
Common Stock        
Class of Stock [Line Items]        
Repurchases of common shares (in shares)   17,600,000   795,100,000
Common stock cancelled (in shares)     22,000,000.0 21,000,000.0
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   0.47% 0.45%