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Earnings (loss) per share (Details) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings (loss) per share      
Weighted average number of shares used for basic earnings (loss) per share 3,303,766,512 3,483,633,816 3,565,973,883
Potential shares to be issued for ILT incentive plan 6,352,583 6,319,989 7,598,593
Potential shares to be issued for Sustainability-linked bond 17,014,702    
Weighted average number of shares used for diluted earnings (loss) per share 3,327,133,797 3,489,953,805 3,573,572,476
Profit (loss) attributable to Eni € 4,771 € 13,887 € 5,821
Remuneration of subordinated perpetual bonds net of tax effect (109) (109) (95)
Remuneration of Sustainability-linked bond net of tax effect 9    
Eni's profit (loss) for basic and diluted earnings (loss) per share € 4,671 € 13,778 € 5,726
Basic earnings (loss) per share € 1.41 € 3.96 € 1.61
Diluted earnings (loss) per share € 1.4 € 3.95 € 1.6