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Income Tax - Additional Information (Detail) - EUR (€) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statements [Line Items] |  |  |  |
statutory tax rate | 29.10% | 29.10% | 29.10% |
corporate income tax rate | 21.00% | 21.00% | 21.00% |
Percentage on limitation on tax loss carryforwards after prior period | 80.00% |  |  |
Percentage on limitation on tax loss carryforwards before prior period |  |  |  | 100.00%
Effective income tax reconciliation permanent effect share listing expense | € 153 |  |  |
Indefinite Tax Losses Carryforward [Member] |  |  |  |
Statements [Line Items] |  |  |  |
Tax effect of tax losses | 288 | € 219 |  |
Twenty Six Year Tax Losses Carryforward [Member] |  |  |  |
Statements [Line Items] |  |  |  |
Tax effect of tax losses | € 26 |  |  |

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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