Note 38 Insurance And Reinsurance Contracts In Income And Expense (Details) - EUR (€)	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Insurance and reinsurance contracts in income and expense [Line Items]
Income arising from insurance contracts	€ 1,350,000,000	€ 1,307,000,000
Expense arising from insurance contracts	909,000,000	765,000,000
Net income arising from insurance contracts	€ 441,000,000	€ 542,000,000

The amount of expense arising from insurance contracts. [Refer: Types of insurance contracts [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 4
-IssueDate 2020-01-01
-Paragraph 37
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_37_b&doctype=Standard&book=b
-URIDate 2020-01-01

Name:	ifrs-full_ExpenseArisingFromInsuranceContracts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration