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Capital and Funding - Summary of Currency Retranslation Reserve (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Movement in foreign currency translation reserve [Abstract] |  |
Currency retranslation reserve beginning balance | € (3,034) | € (3,285)
Currency retranslation during the year | (50) | 599
Movement in net investment hedges and exchange differences in net investments in foreign operations | (909) | (365)
Recycled to income statement | 66 | 17
Currency retranslation reserve ending balance | € (3,927) | € (3,034)

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- Definition The amount of reclassification adjustments related to change in value of foreign currency basis spreads, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_92&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition A component of equity representing the accumulated change in the value of foreign currency basis spreads of financial instruments when excluding them from the designation of these financial instruments as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_78_e&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 9 -IssueDate 2016-01-13 -Paragraph 6.5.16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2016-03-30&anchor=para_6.5.16&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Fair value movements on available for sale investments recycled to income statement group. + References No definition available. + Details
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- Definition Gain (loss) in net investment hedges and exchange differences in net investments in foreign operations. + References No definition available. + Details
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- Definition Movement in foreign currency translation reserve. + References No definition available. + Details
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