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Shareholders' equity - Additional information (Details) - EUR (€) |  |  | 12 Months Ended
--- | --- | --- | ---
May 14, 2019 | Apr. 13, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share capital |  |  | € 4,005,000,000 | € 4,005,000,000 |
Dividend per share to fully settle prior year dividend | € 0.41 |  | € 0.41 | € 0.40 | € 0.40
Dividends recognised as distributions to owners per share | 0.83 |  |  |  |
Interim dividends paid per share relating to prior year | € 0.42 |  | € 0.42 | € 0.40 | € 0.40
Number of treasury shares |  |  | 61,635,679 | 33,045,197 |
Payments to acquire or redeem entity's shares |  |  | € 400,000,000 |  |
Other reserves |  |  | 190,000,000 | € 190,000,000 |
Treasury shares |  |  | 981,000,000 | 581,000,000 |
Dividends recognised as distributions to owners of parent, relating to current year |  |  | € 1,542,000,000 | € 1,513,000,000 | € 1,441,000,000
Interim dividends paid per share |  |  | € 0.43 | € 0.42 | € 0.40
Distributable reserves |  |  | € 43,000,000,000 |  |
Long-Term Monetary Incentive Plan 2017 - 2019 |  |  |  |  |
Authorised number of treasury shares to be disposed |  | € 11,000,000 |  |  |
Shareholder meeting in May 2019 |  |  |  |  |
Period of time from date of resolution to proceed with purchase of shares | 18 months |  |  |  |
Number of Shares Authorised To Buyback | 67,000,000 |  |  |  |
Number of Shares Authorised to Buyback, Percentage of Share Capital | 1.84% |  |  |  |
Total Outlay for Number of Shares Authorised To Buyback | € 1,200,000,000 |  |  |  |
Number of treasury shares |  |  | 28,590,482 |  |
Payments to acquire or redeem entity's shares |  |  | € 400,000,000 |  |
Merger reserve |  |  |  |  |
Other reserves |  |  | 127,000,000 |  |
ENI SpA |  |  |  |  |
Share capital |  |  | 4,005,358,876 | € 4,005,358,876 |
Other reserves |  |  | € 63,000,000 |  |
ENI SpA | Ordinary shares |  |  |  |  |
Number of shares issued |  |  | 3,634,185,330 | 3,634,185,330 |

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