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Related parties - Number of ING Groep N.V. shares and stock options to key management personnel (Details) - shares | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of key management personnel compensation [Line Items] |  |  |
Issued share capital, ordinary shares (in shares) | 3,147,391,000 | 3,498,194,000 | 3,726,539,000
ING Groep N.V. | Executive Board of ING Groep N.V. |  |  |
Disclosure of key management personnel compensation [Line Items] |  |  |
Issued share capital, ordinary shares (in shares) | 152,652 | 128,241 |
ING Groep N.V. | Management Board Banking |  |  |
Disclosure of key management personnel compensation [Line Items] |  |  |
Issued share capital, ordinary shares (in shares) | 343,055 | 262,507 |
ING Groep N.V. | Supervisory Board members |  |  |
Disclosure of key management personnel compensation [Line Items] |  |  |
Issued share capital, ordinary shares (in shares) | 5,295 | 5,295 |

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d&doctype=Standard -URIDate 2024-03-27 + Details
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