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Income taxes (Details 1) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Income Tax Explanatory [Line Items]
Profit (loss) before taxation	€ 10,107	€ 6,844	€ 892
Tax rate (IRES) (%)	24.00%	(24.00%)	27.50%
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
Net Tax Effect	3,544	1,824	1,691
Effective tax charge	€ 5,970	€ 3,467	€ 1,936

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Increase Decrease Tax Expense Income At Applicable Tax Rate [Abstract]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to the tax regime provided for intercompany dividends.

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to regional income tax.

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The applicable income tax rate.

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The profit (loss) before tax expense or income. [Refer: Profit (loss)]

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