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Provisions for employee benefits - Effects of a possible change in the main actuarial assumptions (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Benefit Plans [Line Items]    
Percentage of reasonably possible increase in actuarial assumption 0.50% 0.50%
Percentage of reasonably possible decrease in actuarial assumption 0.50% 0.50%
Other benefit plans | Actuarial assumption of discount rates    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in other benefit obligation due to reasonably possible increase in actuarial assumption € (3) € (4)
Increase (decrease) in other benefit obligation due to reasonably possible decrease in actuarial assumption 3 1
Other benefit plans | Actuarial assumption of expected rates of inflation    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in other benefit obligation due to reasonably possible increase in actuarial assumption 1 1
Italian defined benefit plans | Actuarial assumption of discount rates    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (6) (9)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 7 9
Italian defined benefit plans | Actuarial assumption of expected rates of inflation    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption 4 6
Foreign defined benefit plan | Actuarial assumption of discount rates    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (33) (49)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 34 55
Foreign defined benefit plan | Actuarial assumption of expected rates of inflation    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption 19 34
Foreign defined benefit plan | Actuarial assumption of expected rates of salary increases    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption 10 11
Foreign defined benefit plan | Actuarial assumption of expected rates of pension increases    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption 13 28
FISDE and other foreign medical plans | Actuarial assumption of discount rates    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption (6) (10)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption 7 11
FISDE and other foreign medical plans | Actuarial assumption of medical cost trend rates    
Disclosure Of Benefit Plans [Line Items]    
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption € 6 € 10