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Long-term debt and current portion of long-term debt (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Long-term portion | € 20,179 | € 20,564
Short-term portion | 2,242 | 3,396
Total | 24,707 | 27,239
Banks [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Long-term portion | 3,200 | 4,014
Short-term portion | 801 | 272
Total | 4,001 | 4,286
Ordinary bonds [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Long-term portion | 16,520 | 16,044
Short-term portion | 1,445 | 2,959
Total | 17,965 | 19,003
Convertible bonds [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Long-term portion | 387 | 383
Total | 387 | 383
Other financial institutions [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Long-term portion | 72 | 123
Short-term portion | 40 | 48
Total | 112 | 171
Long-term debt and current portion of long-term debt [Member] |  |
DisclosureOfBorrowingsExplanatoryLineItems [Line Items] |  |
Long-term portion | 20,179 | 20,564
Short-term portion | 2,286 | 3,279
Total | € 22,465 | € 23,843

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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