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Cash and cash equivalents (Details Textual) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	€ 7,363	€ 5,674	€ 5,209	€ 6,614
Short-term deposits, classified as cash equivalents	€ 5,591	€ 4,379
Average interest rate of financial assets within 90 days	(0.03%)	(0.01%)

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- Definition

The average interest rate of financial assets within 90 days.

+ References

No definition available.

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- References

No definition available.

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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