v3.25.2
Share-based compensation plans and shares held in trust - Narrative (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting period of share-based compensation 3 years  
Ordinary shares | Shares held by employee share trusts    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of share options outstanding (in shares) 24.2 23.9
A class American Depositary Shares | Shares held by employee share trusts    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of share options outstanding (in shares) 6.8 4.5
Bottom of range | Share awards under PSP and LTIP    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting percentage of share-based compensation 0.00%  
Top of range | Share awards under PSP and LTIP    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Vesting percentage of share-based compensation 200.00%