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Income taxes (Details Textual) - EUR (€) € in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Current tax expense (income) |  | € 4,021 | € 2,999 | € 4,388
Applicable tax rate |  | 24.00% | 27.50% | 27.50%
Tax effect of foreign tax rates |  | € 1,882 | € 1,152 | € 2,576
Tax Effect Of Write-off of Deferred Tax Assets and Recalculation of Tax Rates |  | (96) | 397 | 1,514
Tax Effect Of Write-off of Deferred Tax Assets |  |  |  | 1,058
Tax Effect Of Regional Income Tax |  | 77 | 42 | 100
Changes In Tax Rates Or Tax Laws Enacted Or Announced [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Applicable tax rate | 24.00% |  |  |
IRAP [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Tax Effect Of Write-off of Deferred Tax Assets and Recalculation of Tax Rates |  |  |  | 54
Outside Italy [Member] | Foreign Tax Authority [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Current tax expense (income) |  | 666 |  |
Italian subsidiaries [Member] | Italy [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Current tax expense (income) |  | 712 | 195 | 155
Italian subsidiaries [Member] | Italy [Member] | IRES [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Current tax expense (income) |  | 26 |  |
Italian subsidiaries [Member] | Italy [Member] | IRAP [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Current tax expense (income) |  | 20 |  |
Exploration Production Segment [Member] |  |  |  |
DisclosureOfIncomeTaxExplanatoryLineItems [Line Items] |  |  |  |
Tax effect of foreign tax rates |  | € 1,811 | € 1,211 | € 2,410

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