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Provisions, income tax liabilities and other liabilities - Summary of Sensitivity for Pensions and Other Post-Employment Benefits to Changes in Key Actuarial Assumptions (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Possible decrease in actuarial assumption   (0.50%)
General inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Possible increase in actuarial assumption   0.50%
Pension benefit indexation    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Possible increase in actuarial assumption   0.50%
Healthcare cost inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Possible increase in actuarial assumption   0.50%
Mortality table    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Possible increase in mortality table (in years) 1 year  
France | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   € 90
France | General inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   56
France | Pension benefit indexation    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   57
France | Healthcare cost inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   0
France | Mortality table    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   56
Germany | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   190
Germany | General inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   267
Germany | Pension benefit indexation    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   264
Germany | Healthcare cost inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   0
Germany | Mortality table    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   86
US | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   103
US | General inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   0
US | Pension benefit indexation    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   0
US | Healthcare cost inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   41
US | Mortality table    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   59
UK | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   161
UK | General inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   95
UK | Pension benefit indexation    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   93
UK | Healthcare cost inflation rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   43
UK | Mortality table    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Measurement of defined-benefit obligation   € 118