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Finance income (expense) (Details 2) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Interest income on financial assets designated at fair value through profit or loss	€ 837	€ (482)	€ 160
Derivatives on exchange rate [Member]
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Interest income on financial assets designated at fair value through profit or loss	809	(494)	96
Derivatives on interest rate [Member]
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Interest income on financial assets designated at fair value through profit or loss	€ 28	(12)	31
Options [Member]
DisclosureOfFinanceIncomeExpenseExplanatoryLineItems [Line Items]
Interest income on financial assets designated at fair value through profit or loss		€ 24	€ 33

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- Definition

The amount of interest income on financial assets designated at fair value through profit or loss. [Refer: Interest income; Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2017-03-09

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