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Customer deposits - Schedule of customer deposits by type (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of customer deposits [line items] |  |
Non-interest bearing | € 27,168 | € 25,556
Interest bearing | 664,493 | 624,720
Customer deposits | 691,661 | 650,276
Netherlands |  |
Disclosure of customer deposits [line items] |  |
Non-interest bearing | 26 | 239
Interest bearing | 237,395 | 232,548
Customer deposits | 237,421 | 232,788
Rest of the world |  |
Disclosure of customer deposits [line items] |  |
Non-interest bearing | 27,142 | 25,316
Interest bearing | 427,098 | 392,172
Customer deposits | € 454,240 | € 417,488

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- Definition The amount of deposit liabilities from customers held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DepositsFromCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Interest bearing customer deposits. + References No definition available. + Details
Name: | ing_InterestBearingCustomerDeposits
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Non interest bearing customer deposits. + References No definition available. + Details
Name: | ing_NonInterestBearingCustomerDeposits
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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