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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Income Tax Explanatory [Abstract] |
Disclosure of detailed information about income taxes [text block] |
(€ million) |  | 2018 |  | 2017 |  | 2016
Current taxes: |  |  |  |  |  |  |  |  |  |  |  |
- Italian subsidiaries |  |  | 301 |  |  |  | 712 |  |  |  | 195 |
- subsidiaries of the Exploration & Production segment - outside Italy |  |  | 4,906 |  |  |  | 3,167 |  |  |  | 2,671 |
- other subsidiaries - outside Italy |  |  | 163 |  |  |  | 142 |  |  |  | 133 |
|  |  | 5,370 |  |  |  | 4,021 |  |  |  | 2,999 |
Net deferred taxes: |  |  |  |  |  |  |  |  |  |  |  |
- Italian subsidiaries |  |  | 130 |  |  |  | (464 | ) |  |  | (243 | )
- subsidiaries of the Exploration & Production segment - outside Italy |  |  | 497 |  |  |  | (162 | ) |  |  | (813 | )
- other subsidiaries - outside Italy |  |  | (27 | ) |  |  | 72 |  |  |  | (7 | )
|  |  | 600 |  |  |  | (554 | ) |  |  | (1,063 | )
|  |  | 5,970 |  |  |  | 3,467 |  |  |  | 1,936 |
Disclosure of detailed information about the reconciliation between the statutory tax charge and the effective tax charge [text block] |
(€ million) |  | 2018 |  | 2017 |  | 2016
Profit (loss) before taxation |  |  | 10,107 |  |  |  | 6,844 |  |  |  | 892 |
Tax rate (IRES) (%) |  |  | 24.0 |  |  |  | 24.0 |  |  |  | 27.5 |
Statutory corporation tax charge (credit) on profit or loss |  |  | 2,426 |  |  |  | 1,643 |  |  |  | 245 |
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |  |
- higher tax charges related to subsidiaries outside Italy |  |  | 3,096 |  |  |  | 1,882 |  |  |  | 1,152 |
- impact pursuant to the write-off of deferred tax assets and recalculation of tax rates |  |  | 252 |  |  |  | (96 | ) |  |  | 397 |
- effect due to the tax regime provided for intercompany dividends |  |  | 47 |  |  |  | 1 |  |  |  | 87 |
- Italian regional income tax (IRAP) |  |  | 50 |  |  |  | 77 |  |  |  | 42 |
- effect due to non-taxable gains/losses on sales of investments |  |  | (1 | ) |  |  | (177 | ) |  |  | 8 |
- impact pursuant to redetermination of the Italian Windfall Corporate tax as per Law 7/2009 |  |  |  |  |  |  | 61 |  |  |  |  |
- other adjustments |  |  | 100 |  |  |  | 76 |  |  |  | 5 |
|  |  | 3,544 |  |  |  | 1,824 |  |  |  | 1,691 |
Effective tax charge |  |  | 5,970 |  |  |  | 3,467 |  |  |  | 1,936 |

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