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Taxation - Additional Information (Detail) - EUR (€) € in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of changes in deferred tax liability (asset) [Abstract] |  |  |  |
Tax benefit | € 578 | € (578) | € 0 | € 0
Federal tax rate | 21.00% |  |  |
Unused tax losses for which deferred tax asset recognised or not |  | 4,676 | 4,138 |
Unused tax credits for which deferred tax asset recognised or not |  | 612 | 644 |
Unused tax losses for which no deferred tax asset recognised |  | 4,179 | 3,622 |
Unused tax credits for which no deferred tax asset recognised |  | 612 | 629 |
Tax losses and credits for which deferred tax has not been recognized and which have a date to expire |  | 2,934 | 2,363 |
Other deductible temporary differences for which no deferred tax asset recognised |  | 51 | 52 |
Aggregate amount of temporary differences associated with undistributed earnings of subsidiaries for which deferred tax liabilities have not been recognised |  | € 1,719 | € 1,557 |

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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_f&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_e&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_e&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition New US tax rate. + References No definition available. + Details
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- Definition Other deductible temporary differences for which no deferred tax asset is recognised. + References No definition available. + Details
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- Definition Tax expense (benefit) due to change in USA tax rates. + References No definition available. + Details
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- Definition Tax losses and credits for which no deferred tax asset recognised and which have date to expire. + References No definition available. + Details
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- Definition Unused tax credits for which deferred tax asset recognised or not. + References No definition available. + Details
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- Definition Unused tax losses for which deferred tax asset recognised or not. + References No definition available. + Details
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