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Income Taxes - Additional Information (Detail) - EUR (€) € in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2020 | Jan. 01, 2020 | Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income tax expense benefits [line items] |  |  |  |  |  |
Weighted average applicable statutory tax rate |  |  |  | 20.10% | 23.70% | 29.40%
Deferred tax benefit caused by decrease of the United States corporate income tax rate |  |  |  |  |  | € 479
United States [member] |  |  |  |  |  |
Income tax expense benefits [line items] |  |  |  |  |  |
Effective tax rate |  |  |  |  | 21.00% | 35.00%
Corporate income tax rate |  |  | 21.00% |  |  | 35.00%
United States [member] | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |
Income tax expense benefits [line items] |  |  |  |  |  |
Corporate income tax rate |  |  | 21.00% |  |  | 35.00%
United Kingdom [member] | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |
Income tax expense benefits [line items] |  |  |  |  |  |
Corporate income tax rate | 17.00% |  |  |  | 19.00% |
The Netherlands [member] | Changes in tax rates or tax laws enacted or announced [member] |  |  |  |  |  |
Income tax expense benefits [line items] |  |  |  |  |  |
Corporate income tax rate |  | 21.70% |  |  | 25.00% |

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- Definition Income tax expense benefits. + References No definition available. + Details
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- Definition Tax cuts and jobs act of 2017 deferred income tax expense benefit + References No definition available. + Details
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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 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 + Details
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