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Customer deposits - Additional Information (Details) - EUR (€) € in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Disclosure of customer deposits [line items] |  |
Current accounts / Overnight deposits | € 232,153 | € 227,827
Savings accounts | 379,403 | 354,560
Time deposits | 120,143 | 107,695
Private individuals |  |
Disclosure of customer deposits [line items] |  |
Current accounts / Overnight deposits | 109,027 | 107,068
Savings accounts | 347,622 | 324,135
Time deposits | € 56,151 | € 56,599

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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

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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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- Details
Name: | ing_CustomerDepositsByCustomerAxis=ing_PrivateIndividualsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |