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Earnings (loss) per share (Details) - EUR (€)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings (loss) per share      
Weighted average number of shares used for basic earnings (loss) per share 3,565,973,883 3,572,549,651 3,592,249,603
Potential shares to be issued for ILT incentive plan 7,598,593   2,251,406
Weighted average number of shares used for diluted earnings per share 3,573,572,476 3,572,549,651 3,594,501,009
Net profit (loss) attributable to Eni € 5,821 € (8,635) € 148
Remuneration of subordinated perpetual bonds net of tax effect (95)    
Eni's net profit (loss) for basic and diluted earnings (loss) per share € 5,726 € (8,635) € 148
Basic earnings (loss) per share € 1.61 € (2.42) € 0.04
Diluted earnings (loss) per share € 1.60 € (2.42) € 0.04