v3.25.2
Share-based compensation plans and shares held in trust - Schedule of Share Awards Under the PSP and LTIP (Details) - Share awards under PSP and LTIP - shares
shares in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Share Based Compensation Expense [Line Items]      
Weighted Average remaining contractual life (years) 10 months 24 days 1 year 1 month 6 days 1 year 2 months 12 days
A class shares      
Disclosure Of Share Based Compensation Expense [Line Items]      
Beginning balance (in shares) 0 38  
Assimilation of ordinary A and B shares into ordinary shares (in shares)   (38)  
Granted (in shares)   0  
Forfeited (in shares)   0  
Ending balance (in shares)   0 38
B class shares      
Disclosure Of Share Based Compensation Expense [Line Items]      
Beginning balance (in shares) 0 12  
Assimilation of ordinary A and B shares into ordinary shares (in shares)   (12)  
Granted (in shares)   0  
Forfeited (in shares)   0  
Ending balance (in shares)   0 12
Ordinary shares      
Disclosure Of Share Based Compensation Expense [Line Items]      
Beginning balance (in shares) 58    
Assimilation of ordinary A and B shares into ordinary shares (in shares)   50  
Granted (in shares) 19 28  
Vested (in shares) (17) (13)  
Forfeited (in shares) (2) (7)  
Ending balance (in shares) 58 58  
A class American Depositary Shares      
Disclosure Of Share Based Compensation Expense [Line Items]      
Beginning balance (in shares) 10 9  
Granted (in shares) 3 4  
Vested (in shares) (3) (2)  
Forfeited (in shares) 0 (1)  
Ending balance (in shares) 10 10 9