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Commitments and Contingent Liabilities - Additional Information (Detail) - EUR (€) € in Millions | Dec. 31, 2020 | Dec. 31, 2019
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United Kingdom [Member] | Issue Of Intangible Assets And Permanent Establishment [Member] |  |
Disclosure of contingent liabilities [line items] |  |
Tax Assessment Relating To NV Permanent Establishment in UK |  | € 141
Brazil [member] |  |
Disclosure of contingent liabilities [line items] |  |
Corporate reorganisation tax assessment | € 2,040 | € 2,235
Potential tax litigation cases that will move to Judicial courts | € 863 |

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