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Provisions for employee benefits - Maturity analysis (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 786 € 819
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 341 € 301
Other benefit plans | Average    
Disclosure Of Benefit Plans [Line Items]    
Weighted average duration of benefit obligation 2 years 6 months 3 years 1 month 6 days
Other benefit plans | within 1 year    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 94 € 83
Other benefit plans | Later than one year and not later than two years    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 95 80
Other benefit plans | Later than two years and not later than three years    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 85 69
Other benefit plans | Later than three years and not later than four years    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 30 25
Other benefit plans | Later than four years and not later than five years    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 16 11
Other benefit plans | beyond 5 years    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 21 33
Italian defined benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 177 € 227
Italian defined benefit plans | Average    
Disclosure Of Benefit Plans [Line Items]    
Weighted average duration of defined benefit obligation 7 years 6 months 9 years 9 months 18 days
Italian defined benefit plans | within 1 year    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) € 14 € 16
Italian defined benefit plans | Later than one year and not later than two years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 13 16
Italian defined benefit plans | Later than two years and not later than three years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 14 18
Italian defined benefit plans | Later than three years and not later than four years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 17 20
Italian defined benefit plans | Later than four years and not later than five years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 15 20
Italian defined benefit plans | beyond 5 years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 104 137
Foreign defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 142 € 129
Foreign defined benefit plan | Average    
Disclosure Of Benefit Plans [Line Items]    
Weighted average duration of defined benefit obligation 13 years 2 months 12 days 17 years 7 months 6 days
Foreign defined benefit plan | within 1 year    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) € 29 € 23
Foreign defined benefit plan | Later than one year and not later than two years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 28 24
Foreign defined benefit plan | Later than two years and not later than three years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 26 29
Foreign defined benefit plan | Later than three years and not later than four years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 35 24
Foreign defined benefit plan | Later than four years and not later than five years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 31 25
Foreign defined benefit plan | beyond 5 years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) (7) 4
FISDE and other foreign medical plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 126 € 162
FISDE and other foreign medical plans | Average    
Disclosure Of Benefit Plans [Line Items]    
Weighted average duration of defined benefit obligation 11 years 6 months 13 years 7 months 6 days
FISDE and other foreign medical plans | within 1 year    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) € 7 € 9
FISDE and other foreign medical plans | Later than one year and not later than two years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | Later than two years and not later than three years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | Later than three years and not later than four years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | Later than four years and not later than five years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | beyond 5 years    
Disclosure Of Benefit Plans [Line Items]    
Net defined benefit liability (asset) € 91 € 125