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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 |  |

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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

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

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