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Deferred tax liabilities (Details Textual) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liability (asset) | € 4,269 | € 4,286 |
Net deferred tax liabilities | 1,822 | 2,877 | € 3,572
Deferred tax liabilities, net | 5,900 | 6,667 |
Carry-forward tax losses indefinitely | 13,545 |  |
Deferred tax assets | 4,078 | 3,790 |
Provision for impairments deferred tax assets | 5,262 | 5,622 | € 5,099
Carry-forward tax losses | 17,773 |  |
Deductions deferred tax liabilities, net | 404 | (532) |
Deferred tax assets impairment | 115 |  |
Unused Tax Losses [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets | 2,421 | € 2,819 |
Fair Value Measurement Of Derivatives Designated As Cash Flow Hedge [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax liabilities, net | 57 |  |
Revaluation Of Defined Benefit Plans [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Deferred tax assets | 19 |  |
Italian Companies [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Provision for impairments deferred tax assets | 3,947 |  |
Carry-forward tax losses | 10,097 |  |
Foreign Companies [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Provision for impairments deferred tax assets | 1,315 |  |
Carry-forward tax losses | € 7,676 |  |
Italian subsidiaries [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Average effective tax rate | 24.00% |  |
Foreign subsidiaries [Member] |  |  |
DisclosureOfDeferredTaxLiabilitiesLineItems [Line Items] |  |  |
Average effective tax rate | 36.70% |  |

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