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Provisions for employee benefits - Maturity analysis (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement    
Net benefit liability (asset) € 1,201 € 1,136
Other benefit plans    
Statement    
Net benefit liability (asset) € 268 € 278
Other benefit plans | Average    
Statement    
Weighted average duration of benefit obligation 2 years 9 months 18 days 3 years
Other benefit plans | within 1 year    
Statement    
Net benefit liability (asset) € 71 € 73
Other benefit plans | Later than one year and not later than two years    
Statement    
Net benefit liability (asset) 66 68
Other benefit plans | Later than two years and not later than three years    
Statement    
Net benefit liability (asset) 63 61
Other benefit plans | Later than three years and not later than four years    
Statement    
Net benefit liability (asset) 16 17
Other benefit plans | Later than four years and not later than five years    
Statement    
Net benefit liability (asset) 12 14
Other benefit plans | beyond 5 years    
Statement    
Net benefit liability (asset) 40 45
Italian defined benefit plans    
Statement    
Net defined benefit liability (asset) € 258 € 269
Italian defined benefit plans | Average    
Statement    
Weighted average duration of defined benefit obligation 8 years 2 months 12 days 9 years 4 months 24 days
Italian defined benefit plans | within 1 year    
Statement    
Net defined benefit liability (asset) € 12 € 17
Italian defined benefit plans | Later than one year and not later than two years    
Statement    
Net defined benefit liability (asset) 13 16
Italian defined benefit plans | Later than two years and not later than three years    
Statement    
Net defined benefit liability (asset) 17 12
Italian defined benefit plans | Later than three years and not later than four years    
Statement    
Net defined benefit liability (asset) 20 10
Italian defined benefit plans | Later than four years and not later than five years    
Statement    
Net defined benefit liability (asset) 21 15
Italian defined benefit plans | beyond 5 years    
Statement    
Net defined benefit liability (asset) 175 199
Foreign defined benefit plan    
Statement    
Net defined benefit liability (asset) € 493 € 412
Foreign defined benefit plan | Average    
Statement    
Weighted average duration of defined benefit obligation 19 years 1 month 6 days 18 years 1 month 6 days
Foreign defined benefit plan | within 1 year    
Statement    
Net defined benefit liability (asset) € 44 € 33
Foreign defined benefit plan | Later than one year and not later than two years    
Statement    
Net defined benefit liability (asset) 42 35
Foreign defined benefit plan | Later than two years and not later than three years    
Statement    
Net defined benefit liability (asset) 50 32
Foreign defined benefit plan | Later than three years and not later than four years    
Statement    
Net defined benefit liability (asset) 63 39
Foreign defined benefit plan | Later than four years and not later than five years    
Statement    
Net defined benefit liability (asset) 67 49
Foreign defined benefit plan | beyond 5 years    
Statement    
Net defined benefit liability (asset) 227 224
FISDE and other foreign medical plans    
Statement    
Net defined benefit liability (asset) € 182 € 177
FISDE and other foreign medical plans | Average    
Statement    
Weighted average duration of defined benefit obligation 13 years 8 months 12 days 13 years 3 months 18 days
FISDE and other foreign medical plans | within 1 year    
Statement    
Net defined benefit liability (asset) € 8 € 9
FISDE and other foreign medical plans | Later than one year and not later than two years    
Statement    
Net defined benefit liability (asset) 7 8
FISDE and other foreign medical plans | Later than two years and not later than three years    
Statement    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | Later than three years and not later than four years    
Statement    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | Later than four years and not later than five years    
Statement    
Net defined benefit liability (asset) 7 7
FISDE and other foreign medical plans | beyond 5 years    
Statement    
Net defined benefit liability (asset) € 146 € 139