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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

Corporate income tax rate.

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Income tax expense benefits.

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Tax cuts and jobs act of 2017 deferred income tax expense benefit

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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

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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
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-Paragraph 81
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-URIDate 2019-03-27

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