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Taxation - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Unused tax losses for which deferred tax asset recognised or not | € 4,808 | € 4,790
Unused tax credits for which deferred tax asset recognised or not | 454 | 524
Unused tax losses for which no deferred tax asset recognised | 4,246 | 4,272
Unused tax credits for which no deferred tax asset recognised | 429 | 497
Tax losses for which deferred tax has not been recognized and which have a date to expire | 4,195 | 4,108
Other deductible temporary differences for which no deferred tax asset recognised | 1,445 | 48
Aggregate amount of temporary differences associated with undistributed earnings of subsidiaries for which deferred tax liabilities have not been recognised | 2,097 | 2,476
Uncertain tax provision | 879 | € 787
Uncertain tax provision for amortization of intangible asset | 186 |
Adjustment of uncertain tax provision related to amortization of goodwill | 59 |
Interest expense for which no Deferred tax asset has been recognised | € 1,193 |

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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 2020-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_f&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Adjustment of provision relating to tax expenses. + 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 Provision For amortization of intangible asset. + References No definition available. + Details
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- Definition Tax losses for which no deferred tax asset recognised and which have date to expire. + References No definition available. + Details
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- Definition Unrecognised Tax provision. + 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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