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Shareholders’ equity (Details 1) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Shareholders Equity Details 1 |  |
Share capital | € 4,005 | € 4,005
Legal reserve | 959 | 959
Reserve for treasury shares | 581 | 581
Reserve related to the fair value of cash flow hedging derivatives net of the tax effect | 183 | 189
Reserve related to the fair value of available-for-sale securities net of the tax effect |  | 4
Reserve related to the defined benefit plans net of tax effect | (114) | (112)
Other reserves | 280 | 211
Cumulative currency translation differences | 4,818 | 10,319
Treasury shares | 581 | 581
Retained earnings | 35,966 | 40,367
Interim dividend | (1,441) | (1,441)
Net profit (loss) for the year | 3,374 | (1,464)
Equity attributable to owners of parent | € 48,030 | € 53,037

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- Definition Represents the reserve of gains and losses on re-measuring available for sale financial assets net of the tax effects. + References No definition available. + Details
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- Definition A component of equity representing the reserve for the redemption of the entity's own shares. + 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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