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Basis of preparation - Disclosure of sensitivity analysis for actuarial assumptions (Details)
€ in Millions
Dec. 31, 2025
EUR (€)
Pension benefits | Actuarial assumption of discount rates  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage of reasonably possible increase in actuarial assumption 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 511
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (489)
Pension benefits | Actuarial assumption of discount rates | Germany and France  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 90
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (85)
Pension benefits | Actuarial assumption of discount rates | UK  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 42
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (40)
Pension benefits | Actuarial assumption of discount rates | U.S. and Canada  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 373
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (358)
Pension benefits | Actuarial assumption of discount rates | Other  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 6
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € (6)
Health care and life insurance plans | Actuarial assumption of discount rates  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage of reasonably possible increase in actuarial assumption 0.25%
Percentage of reasonably possible decrease in actuarial assumption 0.25%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € 59
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € (57)
Health care and life insurance plans | Actuarial assumption of medical cost trend rates  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage of reasonably possible increase in actuarial assumption 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption € (13)
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 15