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Long-term debt and current portion of long-term debt (Details 5) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Fair value of long-term debt	€ 23,764	€ 25,358
Ordinary bonds [member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Fair value of long-term debt	19,219	20,501
Convertible bonds [member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Fair value of long-term debt	410	435
Banks [member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Fair value of long-term debt	4,021	4,244
Other financial institutions [member]
DisclosureOfBorrowingsExplanatoryLineItems [Line Items]
Fair value of long-term debt	€ 114	€ 178

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

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