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Other liabilities - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other liabilities [abstract] |  |  |
Payments of lease liabilities, classified as financing activities | € 291 | € 296 | € 301
Share buyback programme, liability | € 538 | € 297 |

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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17_e&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ing_DisclosureOfOtherLiabilitiesAbstract
Namespace Prefix: | ing_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Buyback Programme, Liability + References No definition available. + Details
Name: | ing_ShareBuybackProgrammeLiability
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant