v3.25.4
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, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Share Based Compensation Expense [Line Items]      
Weighted average remaining contractual life (years) 10 months 24 days 10 months 24 days 10 months 24 days
Number of ordinary shares (million)      
Disclosure Of Share Based Compensation Expense [Line Items]      
Beginning balance (in shares) 49 58  
Granted (in shares) 21 20  
Vested (in shares) (31) (26)  
Forfeited (in shares) (3) (3)  
Ending balance (in shares) 36 49 58
Number of ADSs (million)      
Disclosure Of Share Based Compensation Expense [Line Items]      
Beginning balance (in shares) 9 10  
Granted (in shares) 4 3  
Vested (in shares) (5) (4)  
Forfeited (in shares) 0 0  
Ending balance (in shares) 8 9 10