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Employee benefit obligations - Weighted Average Assumptions Used For Actuarial Valuations (Details)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
United Kingdom      
Disclosure of defined benefit plans [line items]      
Discount rate 5.20% 4.70% 5.10%
Rate of increase in pensions in payment 2.60% 2.50% 4.40%
Inflation 3.20% 3.10% 3.00%
North America      
Disclosure of defined benefit plans [line items]      
Discount rate 5.40% 4.90% 5.20%
Western Continental Europe      
Disclosure of defined benefit plans [line items]      
Discount rate 3.30% 3.40% 4.10%
Rate of increase in salaries 2.50% 2.50% 2.50%
Rate of increase in pensions in payment 2.00% 2.00% 2.00%
Inflation 2.00% 2.00% 2.00%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe      
Disclosure of defined benefit plans [line items]      
Discount rate 6.40% 6.50% 6.40%
Rate of increase in salaries 6.20% 6.20% 5.70%
Inflation 2.90% 3.40% 3.40%