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Legal proceedings - Additional information (Details) € in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022 EUR (€)	Dec. 31, 2023 EUR (€) classAction	Dec. 31, 2021 EUR (€)
Disclosure of Legal Proceedings [line items]
Damages claimed		€ 500
Spain
Disclosure of Legal Proceedings [line items]
Class actions filed | classAction		3
Class actions where agreement was reached | classAction		1
Certain consumer credit products
Disclosure of Legal Proceedings [line items]
Legal proceedings provision			€ 180
Increase in legal proceedings provision	€ 75

X

- Definition

The amount of provision for legal proceedings. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Section Example 10 A court case
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10_TI
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2023-01-01
-Paragraph 87
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2023-en-r&anchor=para_87&doctype=Standard
-URIDate 2023-03-23

+ Details

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

X

- Definition

Additional Provisions, Legal Provisions

+ References

No definition available.

+ Details

Name:	ing_AdditionalProvisionsLegalProvisions
Namespace Prefix:	ing_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Damages Claimed In Litigation Case

+ References

No definition available.

+ Details

Name:	ing_DamagesClaimedInLitigationCase
Namespace Prefix:	ing_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items representing legal proceedings.

+ References

No definition available.

+ Details

Name:	ing_DisclosureOfLegalProceedingsLineItems
Namespace Prefix:	ing_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Class Actions, Agreement Reached

+ References

No definition available.

+ Details

Name:	ing_NumberOfClassActionsAgreementReached
Namespace Prefix:	ing_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Class Actions Filed

+ References

No definition available.

+ Details

Name:	ing_NumberOfClassActionsFiled
Namespace Prefix:	ing_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_ES
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=ing_CertainConsumerCreditProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: