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Legal proceedings - Additional information (Details) € in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2025 lawsuit | Apr. 30, 2024 director | Mar. 31, 2024 claimant | Jan. 31, 2024 appeal | Sep. 30, 2022 EUR (€) | Dec. 31, 2024 EUR (€) classAction | Dec. 31, 2021 EUR (€)
Disclosure of Legal Proceedings [line items] |  |  |  |  |  |  |
Damages claimed |  |  |  |  |  | € 587 |
Number of former directors of Payvision issued a penalty order | director |  | 2 |  |  |  |  |
Number of appeals filed by client | appeal |  |  |  | 1 |  |  |
Number of claimants dissolved | claimant |  |  | 1 |  |  |  |
Conclusion Of Litigation |  |  |  |  |  |  |
Disclosure of Legal Proceedings [line items] |  |  |  |  |  |  |
Lawsuit in favor of ING | lawsuit | 3 |  |  |  |  |  |
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 2024-01-01 -Section Example 10 A court case -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10_TI -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2024-01-01 -Paragraph 87 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2024-en-r&anchor=para_87&doctype=Standard -URIDate 2024-03-27 + Details
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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
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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
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Namespace Prefix: | ing_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lawsuit Finalised In Favor Of ING + References No definition available. + Details
Name: | ing_LawsuitFinalisedInFavorOfING
Namespace Prefix: | ing_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Appeals Filed By Client + References No definition available. + Details
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Namespace Prefix: | ing_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Claimants Dissolved + References No definition available. + Details
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Namespace Prefix: | ing_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Class Actions, Agreement Reached + References No definition available. + Details
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Namespace Prefix: | ing_
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Balance Type: | na
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- Definition Number Of Class Actions Filed + References No definition available. + Details
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Namespace Prefix: | ing_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Former Directors Issued A Penalty Order + References No definition available. + Details
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Namespace Prefix: | ing_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |