Number of Employees - Additional Information (Detail)	Dec. 31, 2018 Employees	Dec. 31, 2017 Employees	Dec. 31, 2016 Employees
Disclosure of number of employees [line items]
Number of employees employed	26,543	28,318	29,380
Aegon N.V [member]
Disclosure of number of employees [line items]
Number of employees employed	0	0

The number of personnel employed by the entity at a date.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_NumberOfEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant