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Financial assets held for trading (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfFinancialAssetsHeldForTradingLineItems [Line Items] |  |  |
Current financial assets at fair value through profit or loss, classified as held for trading | [1] | € 6,012 | € 6,166
Quoted bonds issued by sovereign states [Member] |  |  |
DisclosureOfFinancialAssetsHeldForTradingLineItems [Line Items] |  |  |
Current financial assets at fair value through profit or loss, classified as held for trading |  | 1,022 | 996
Other [Member] |  |  |
DisclosureOfFinancialAssetsHeldForTradingLineItems [Line Items] |  |  |
Current financial assets at fair value through profit or loss, classified as held for trading |  | € 4,990 | € 5,170
[1] | Income or expense were recognized in the profit and loss account within &#147;Finance income (expense)&#148;.

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- Definition The amount of current financial assets measured at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: 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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