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Other information about investments - Additional (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2022
Dec. 31, 2023
Disclosure of detailed information about investments      
Non-controlling interest € 2,863   € 460
Change in non‐controlling interest 588 € 477  
Consideration 2,060 € 1,667 € 1,432
Eni Marine Services SpA      
Disclosure of detailed information about investments      
Non-controlling interest € 1,924    
Eni Plenitude Spa SB      
Disclosure of detailed information about investments      
Percentage of ownership interest divested 7.58%    
Change in non‐controlling interest € 588    
Evolvere SpA Soc. Ben.      
Disclosure of detailed information about investments      
Equity interest acquired (as a percent)     29.48%
Consideration     € 60
EniPower Group      
Disclosure of detailed information about investments      
Proportion of ownership interest in subsidiary (as a percent) 51.00%    
Non-controlling interest € 446   406
Eni Plenitude Group      
Disclosure of detailed information about investments      
Proportion of ownership interest in subsidiary (as a percent) 92.42%    
Non-controlling interest € 491   € 54