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Employee Benefit Obligations - Weighted Average Assumptions Used For Actuarial Valuations (Details)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
United Kingdom        
Disclosure of defined benefit plans [line items]        
Discount rate 4.70% 5.10% 1.80% 1.30%
Rate of increase in pensions in payment 2.50% 4.40% 4.50% 4.40%
Inflation 3.10% 3.00% 3.20% 2.80%
North America        
Disclosure of defined benefit plans [line items]        
Discount rate 4.90% 5.20% 2.60% 2.00%
Rate of increase in salaries       3.00%
Western Continental Europe        
Disclosure of defined benefit plans [line items]        
Discount rate 3.40% 4.10% 1.20% 0.90%
Rate of increase in pensions in payment 2.00% 2.00% 1.80% 1.80%
Rate of increase in salaries 2.50% 2.50% 2.30% 2.20%
Inflation 2.00% 2.00% 1.70% 1.70%
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe        
Disclosure of defined benefit plans [line items]        
Discount rate 6.50% 6.40% 5.30% 4.20%
Rate of increase in salaries 6.20% 5.70% 5.60% 5.20%
Inflation 3.40% 3.40% 3.70% 3.70%