Other Assets and Receivables - Summary of Other Assets and Receivables (Detail) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Other Assets And Receivables [abstract]
Real estate held for own use and equipment	€ 455	€ 472
Receivables	5,622	6,826
Accrued income	1,366	1,356
Right-of-use assets	199	211	€ 255
Other assets and receivables	€ 7,642	€ 8,865	€ 8,842

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2021-01-01
-Paragraph 53
-Subparagraph j
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard
-URIDate 2021-03-24

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