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Provisions for employee benefits - Additional information (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
Estimate of contributions expected to be paid to plan for next annual reporting period 134  
Exploration & Production    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 22 1
Defined benefit plan    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 445 518
Estimate of contributions expected to be paid to plan for next annual reporting period 40  
Other benefit plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 341 € 301
Deferred monetary incentive plans    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 115  
Agreed redundancy plans for workers    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 85  
Isopensione    
Disclosure Of Benefit Plans [Line Items]    
Net benefit liability (asset) 99  
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) € 16