v3.25.4
Employee compensation and benefits - Narrative (Details)
$ in Millions, £ in Billions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
USD ($)
Disclosure of defined benefit plans [line items]          
Expected dividend yield 6.50% 6.25%      
Risk free interest rate, share options granted 4.20% 4.20%      
Defined contribution assets $ 7,175 $ 6,531      
Estimated assets needed to secure all future pension payments       £ 21.3 $ 25,700
Estimate of contributions expected to be paid to plan 109        
Principal plan          
Disclosure of defined benefit plans [line items]          
Estimate of contributions expected to be paid to plan 0        
Other plans          
Disclosure of defined benefit plans [line items]          
Estimate of contributions expected to be paid to plan 109        
Pension Plan          
Disclosure of defined benefit plans [line items]          
Defined contribution assets 7,494 6,799      
Pension Plan | Principal plan          
Disclosure of defined benefit plans [line items]          
Surplus (deficit) in plan       £ 3.7 $ 4,400
Percentage of plan funded       118.00% 118.00%
Defined contribution assets 7,055 6,429 $ 6,808    
Pension Plan | Principal plan | Projected unit credit method          
Disclosure of defined benefit plans [line items]          
Fair value of plan assets, incl. defined contribution assets       £ 23.9 $ 28,800
Pension Plan | Other plans          
Disclosure of defined benefit plans [line items]          
Defined contribution assets $ 439 $ 370 $ 78    
Defined Contribution Pension Plan | Principal plan          
Disclosure of defined benefit plans [line items]          
Defined contribution assets       £ 3.0 $ 3,600