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Taxation - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Unused tax losses for which deferred tax asset recognised or not | € 5,346 | € 4,676
Unused tax credits for which deferred tax asset recognised or not | 570 | 612
Unused tax losses for which no deferred tax asset recognised | 4,914 | 4,179
Unused tax credits for which no deferred tax asset recognised | 570 | 612
Tax losses and credits for which deferred tax has not been recognized and which have a date to expire | 4,752 | 2,934
Other deductible temporary differences for which no deferred tax asset recognised | 48 | 51
Aggregate amount of temporary differences associated with undistributed earnings of subsidiaries for which deferred tax liabilities have not been recognised | € 2,681 | € 1,719

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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 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + 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 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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