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Other operating expenses - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Disclosure Of Other Operating Expense [Line Items] |  |
Contributions to the Single and Local Resolution Funds | € 41 | € 35
Increase (decrease) in local bank taxes | 7 |
Local bank taxes | 261 | 255
Germany, Belgium, Poland |  |
Disclosure Of Other Operating Expense [Line Items] |  |
Contributions to the deposit guarantee schemes | € 136 | € 157

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- Definition The portion of regulatory costs that represents contributions to deposit guarantee schemes. + References No definition available. + Details
Name: | ing_ContributionsToDepositGuaranteeSchemes
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The portion of regulatory costs that represents contributions to Single Resolution Fund. + References No definition available. + Details
Name: | ing_ContributionsToSingleAndLocalResolutionFund
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure Of Other Operating Expense [Line Items] + References No definition available. + Details
Name: | ing_DisclosureOfOtherOperatingExpenseLineItems
Namespace Prefix: | ing_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase in Local bank taxes. + References No definition available. + Details
Name: | ing_IncreaseDecreaseInLocalBankTaxes
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Local bank taxes. + References No definition available. + Details
Name: | ing_LocalBankTaxes
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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