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Costs (Details 7) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss | € 848 | € 1,067 | € 6,537
Reversal of impairment loss recognised in profit or loss | 1,055 | 1,153 |
Impairment loss recognised in other comprehensive income | (225) | (475) | 6,534
Tangible Assets [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss | 848 | 1,067 | 5,993
Reversal of impairment loss recognised in profit or loss | (1,055) | (1,153) | (3)
Intangible Assets [Member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Impairment loss recognised in profit or loss | 14 |  | € 544
Reversal of impairment loss recognised in profit or loss | € (32) | € (389) |

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- Definition The amount of impairment loss recognised in other comprehensive income. Impairment loss on a revalued asset is recognised in other comprehensive income to the extent that the impairment loss does not exceed the amount in the revaluation surplus for that same asset. [Refer: Impairment loss; Revaluation surplus; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_c&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_a&doctype=Standard -URIDate 2017-03-09 + Details
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