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Other operating expenses - Additional information (Details) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) bank | Dec. 31, 2021 EUR (€)
Disclosure Of Other Operating Expense [Line Items] |  |  |
Contributions to the Single Resolution Fund | € 251 | € 354 | € 308
Decrease in local bank taxes | 1 |  |
Local bank taxes | 472 | € 470 | 522
Banks party to Institutional Protection Scheme | bank |  | 7 |
Contributions to Institutional Protection Scheme |  | € 99 |
Netherlands, Germany, Belgium, Poland |  |  |
Disclosure Of Other Operating Expense [Line Items] |  |  |
Contributions to the Deposit Guarantee Schemes | € 320 | € 425 | € 435

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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 Contributions To Institutional Protection Scheme + References No definition available. + Details
Name: | ing_ContributionsToInstitutionalProtectionScheme
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The portion of regulatory costs that represents contributions to Single Resolution Fund. + References No definition available. + Details
Name: | ing_ContributionsToSingleResolutionFund
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

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- 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

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- 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
- Definition Number Of Polish Banks Party To The Institutional Protection Scheme + References No definition available. + Details
Name: | ing_NumberOfPolishBanksPartyToTheInstitutionalProtectionScheme
Namespace Prefix: | ing_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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