Combined Earnings Per Share - Additional Information (Detail)	12 Months Ended
Dec. 31, 2020
Earnings per share [abstract]
Description on diluted earnings per share and underlying earnings per share calculation	In calculating diluted earnings per share and underlying earnings per share, a number of adjustments are made to the number of shares, principally, the exercise of share plans by employees.
Description of common stock unification conversion ratio	NV were issued PLC ordinary shares on a 1:1 ratio

The reconciliation of the denominators used in calculating basic and diluted earnings per share to each other.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2020-01-01
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_ExplanationOfAdjustmentsBetweenDenominatorsUsedToCalculateBasicAndDilutedEarningsPerShare
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration