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Customer deposits - Schedule of customer deposits (Details) - EUR (€) € in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Deposits from customers [abstract] |  |
Current accounts / Overnight deposits | € 232,153 | € 227,827
Savings accounts | 379,403 | 354,560
Time deposits | 120,143 | 107,695
Other | 6,329 | 1,579
Customer deposits | € 738,028 | € 691,661

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- Definition The amount of balances in customers' deposit accounts held by the entity that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_BalancesOnOtherDepositsFromCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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: | ifrs-full_DepositsFromCustomersAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Customer Deposits, Current Accounts And Overnight Deposits + References No definition available. + Details
Name: | ing_CustomerDepositsCurrentAccountsAndOvernightDeposits
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ing_CustomerDepositsSavingsAccounts
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Customer Deposits, Time Deposits + References No definition available. + Details
Name: | ing_CustomerDepositsTimeDeposits
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant