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Employee compensation and benefits - Post-employment benefit plans - Narrative (Details)
$ in Millions, £ in Billions
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
USD ($)
Disclosure of defined benefit plans [line items]        
Defined contribution assets $ 6,531 $ 6,590    
Estimated assets needed to secure all future pension payments     £ 21.3 $ 25,700
Pension Plan        
Disclosure of defined benefit plans [line items]        
Defined contribution assets 6,799 6,886    
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 $ 6,429 $ 6,808   $ 6,334
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
Defined Contribution Pension Plan | Principal plan        
Disclosure of defined benefit plans [line items]        
Defined contribution assets     £ 3.0 $ 3,600