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Principal subsidiaries, investments in associates and joint ventures - Summary of principal subsidiaries, investments in associates and joint ventures (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
TMBThanachart Bank Public Company Limited |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Interest held | 23.00% | 23.00%
ING Bank N.V. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
Bank Mendes Gans N.V. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Belgium S.A./N.V. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Luxembourg S.A. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING-DiBa AG |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Bank Slaski S.A. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 75.00% | 75.00%
Proportion of ownership interests held by non-controlling interests |  | 25.00%
ING Financial Holdings Corporation |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Bank A.S. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Bank (Australia) Ltd |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Commercial Finance B.V. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%
ING Groenbank N.V. |  |
Disclosure of Significant Investments in Principal Subsidiaries, Associates and Joint Ventures [Line Items] |  |
Proportion of ownership and interest held by the group | 100.00% | 100.00%

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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2023-03-23 + Details
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