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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
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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] + References 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 + Details
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