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Deferred tax assets (Details Textual) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfDeferredTaxesLineItems [Line Items]
Net deferred tax assets	€ 4,269	€ 4,286
Deferred tax assets	4,078	3,790
Italy [Member]
DisclosureOfDeferredTaxesLineItems [Line Items]
Deferred tax assets	€ 2,070	€ 1,690

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- References

No definition available.

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- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

+ References

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- Definition

The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

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