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Provisions for employee benefits - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 748 € 786
Estimate of contributions expected to be paid to plan for next annual reporting period 147 40
Defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 395 445
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 353 € 341
Deferred monetary incentive plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 120  
Expansion contracts for workers    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 118  
Isopensione    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 77  
Jubilee Awards    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 26  
Other Long term Plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) € 12