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Earnings (loss) per share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings (loss) per share |
Schedule of information about reconciliation of the weighted average number of shares | Reconciliation of the weighted average number of shares used for the calculation for both basic and diluted earnings (loss) per share was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | 2021 |  | 2020 |  | 2019
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
Eni’s net profit (loss) |  | (€ million) |  | 5,821 |  | (8,635) |  | 148
Remunaration of subordinated perpetual bonds net of tax effect | ​ | (€ million) | ​ | (95) | ​ | — | ​ | —
Eni’s net profit (loss) for basic and diluted earnings (loss) per share |  | (€ million) | ​ | 5,726 |  | (8,635) |  | 148
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic earnings (loss) per share |  | (€ per share) | ​ | 1.61 |  | (2.42) |  | 0.04
Diluted earnings (loss) per share |  | (€ per share) | ​ | 1.60 |  | (2.42) |  | 0.04

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