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Financial assets available for sale (Details 3) € in Millions	12 Months Ended
	Dec. 31, 2017 EUR (€)
DisclosureOfFinancialAssetsAvailableForSaleLineItems [Line Items]
Carrying amount at beginning of period	€ 52,329
Carrying amount at End of period	42,490
Financial Assets Available for sale Category [Member]
DisclosureOfFinancialAssetsAvailableForSaleLineItems [Line Items]
Carrying amount at beginning of period	4
Changes recognized in equity	(4)
Carrying amount at End of period	0
Financial Assets Available for sale Category [Member] | Reserve of gains and losses on remeasuring available-for-sale financial assets [member]
DisclosureOfFinancialAssetsAvailableForSaleLineItems [Line Items]
Carrying amount at beginning of period	5
Changes recognized in equity	(5)
Carrying amount at End of period	0
Financial Assets Available for sale Category [Member] | Reserve of Deferred Tax Liabilities [Member]
DisclosureOfFinancialAssetsAvailableForSaleLineItems [Line Items]
Carrying amount at beginning of period	(1)
Changes recognized in equity	1
Carrying amount at End of period	€ 0

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- References

No definition available.

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- Definition

The increase (decrease) in equity resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Equity]

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- Definition

A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings]

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