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Income taxes (Details 1) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Income Tax Explanatory [Abstract] |  |  |
Profit (loss) before taxation | € 6,844 | € 892 | € (4,277)
Tax rate (IRES) (%) | 24.00% | 27.50% | 27.50%
Statutory corporation tax charge (credit) on profit or loss | € 1,643 | € 245 | € (1,176)
Increase (decrease) resulting from: |  |  |
- higher tax charges related to subsidiaries outside Italy | 1,882 | 1,152 | 2,576
- impact pursuant to the write-off of deferred tax assets and recalculation of tax rates | (96) | 397 | 1,514
- effect due to the tax regime provided for intercompany dividends | 1 | 87 | 114
- Italian regional income tax (IRAP) | 77 | 42 | 100
- effect due to non-taxable gains/losses on sales of investments | (177) | 8 | (39)
- impact pursuant to redetermination of the Italian Windfall Corporate tax as per Law 7/2009 | 61 |  |
- effect due to discontinued operations |  |  | (288)
- other adjustments | 76 | 5 | 321
Net Tax Effect | 1,824 | 1,691 | 4,298
Effective tax charge | € 3,467 | € 1,936 | € 3,122

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