Fee and Commission Income - Summary of Fee and Commission Income (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fee and commission income (expense) [abstract]
Fee income from asset management	€ 1,853	€ 2,126	€ 1,702
Commission income	594	535	562
Other	112	140	144
Total fee and commission income	€ 2,558	€ 2,802	€ 2,408

The amount of fee and commission income that the entity does not separately disclose in the same statement or note. [Refer: Fee and commission income]

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

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration