Other Assets and Receivables - Summary of Accrued Income (Detail) - EUR (€) € in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Other Assets And Receivables [abstract]
Accrued interest	€ 1,436	€ 1,415
Other	6	21
Accrued income	€ 1,442	€ 1,436

The amount of asset representing income that has been earned but is not yet received.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_AccruedIncome
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant