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Provisions, income tax liabilities and other liabilities - Summary of Financial and Demographic Assumptions (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 [1] 2.10% 2.20% 2.50%
Pension benefit indexation 2.10% 2.20%  
Weighted average duration of defined benefit obligation 11 years 10 years 10 years
France | Bottom of range      
Disclosure of defined benefit plans [line items]      
Discount rate [2],[3] 2.95% 2.95% 3.55%
Pension benefit indexation     2.50%
Retirement age 62 years 62 years 62 years
France | Top of range      
Disclosure of defined benefit plans [line items]      
Discount rate [2],[3] 3.40% 3.15% 3.75%
Retirement age 67 years 67 years 67 years
Germany      
Disclosure of defined benefit plans [line items]      
General inflation rate [1] 2.10% 2.20% 2.50%
Pension benefit indexation 2.10% 2.20% 2.50%
Retirement age 63 years 63 years 63 years
Weighted average duration of defined benefit obligation 12 years 12 years 12 years
Germany | Bottom of range      
Disclosure of defined benefit plans [line items]      
Discount rate [2],[3] 2.95% 2.95% 3.55%
Germany | Top of range      
Disclosure of defined benefit plans [line items]      
Discount rate [2],[3] 3.40% 3.15% 3.75%
US      
Disclosure of defined benefit plans [line items]      
Discount rate [2],[3] 5.45% 4.75% 4.90%
Weighted average duration of defined benefit obligation 10 years 11 years 11 years
US | Bottom of range      
Disclosure of defined benefit plans [line items]      
Healthcare cost inflation rate [4] 4.00% 4.00% 3.29%
Retirement age 55 years 55 years 55 years
US | Top of range      
Disclosure of defined benefit plans [line items]      
Healthcare cost inflation rate [4] 5.93% 9.75% 6.56%
Retirement age 70 years 70 years 70 years
UK      
Disclosure of defined benefit plans [line items]      
Discount rate [2],[3] 5.50% 4.50% 4.75%
General inflation rate [1] 3.20% 3.05% 3.25%
Pension benefit indexation 3.00% 2.90% 3.00%
Weighted average duration of defined benefit obligation 11 years 13 years 13 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
[1] (c)Inflation for the euro zone is determined using a multi-criterion method.
[2] (a)The discount rates used were based on market rates for high quality corporate bonds with a duration close to that of the expected benefit payments
under the plans. The benchmarks used to determine discount rates were the same for all periods presented.
[3] (b)The rate depends on the duration of the plan (0 to 7 years, 7 to 10 years, or more than 10 years).
[4] (d)No post-employment healthcare benefits are provided in France since 2020, Germany and UK