Other Assets and Receivables - Summary of Accrued Income (Detail) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Other Assets And Receivables [abstract]
Accrued interest	€ 1,363	€ 1,352
Other	3	4
Accrued income	1,366	1,356
Current	1,366	1,356
Non-current	€ 0	€ 0

The amount of accruals classified as non-current. [Refer: Accruals]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_AccrualsClassifiedAsNoncurrent
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant