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Provisions, income tax liabilities and other liabilities - Summary of Financial and Demographic Assumptions (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Weighted average duration of defined benefit obligation 10 years    
Minimum Plan 1      
Disclosure of defined benefit plans [line items]      
Weighted average duration of defined benefit obligation 0 years    
Maximum Plan 1      
Disclosure of defined benefit plans [line items]      
Weighted average duration of defined benefit obligation 7 years    
Minimum plan 2      
Disclosure of defined benefit plans [line items]      
Weighted average duration of defined benefit obligation 7 years    
Maximum plan 2      
Disclosure of defined benefit plans [line items]      
Weighted average duration of defined benefit obligation 10 years    
France      
Disclosure of defined benefit plans [line items]      
General inflation rate 2.20% 2.50% 1.95%
Pension benefit indexation 2.20% 2.50%  
Weighted average duration of defined benefit obligation 10 years 10 years 12 years
France | Bottom of range      
Disclosure of defined benefit plans [line items]      
Discount rate 2.95% 3.55% 0.10%
Pension benefit indexation     1.95%
Retirement age 62 years 62 years 62 years
France | Top of range      
Disclosure of defined benefit plans [line items]      
Discount rate 3.15% 3.75% 1.10%
Retirement age 67 years 67 years 67 years
Germany      
Disclosure of defined benefit plans [line items]      
General inflation rate 2.20% 2.50% 1.95%
Pension benefit indexation 2.20% 2.50% 1.95%
Retirement age 63 years 63 years 62 years
Weighted average duration of defined benefit obligation 12 years 12 years 16 years
Germany | Bottom of range      
Disclosure of defined benefit plans [line items]      
Discount rate 2.95% 3.55% 0.10%
Germany | Top of range      
Disclosure of defined benefit plans [line items]      
Discount rate 3.15% 3.75% 1.10%
US      
Disclosure of defined benefit plans [line items]      
Discount rate 4.75% 4.90% 2.70%
Weighted average duration of defined benefit obligation 11 years 11 years 15 years
US | Bottom of range      
Disclosure of defined benefit plans [line items]      
Healthcare cost inflation rate 4.00% 3.29% 3.50%
Retirement age 55 years 55 years 55 years
US | Top of range      
Disclosure of defined benefit plans [line items]      
Healthcare cost inflation rate 9.75% 6.56% 4.50%
Retirement age 70 years 70 years 70 years
UK      
Disclosure of defined benefit plans [line items]      
Discount rate 4.50% 4.75% 1.90%
General inflation rate 3.05% 3.25% 3.30%
Pension benefit indexation 2.90% 3.00% 3.15%
Weighted average duration of defined benefit obligation 13 years 13 years 17 years
UK | Bottom of range      
Disclosure of defined benefit plans [line items]      
Retirement age 60 years 60 years 60 years
UK | Top of range      
Disclosure of defined benefit plans [line items]      
Retirement age 65 years 65 years 65 years