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Other operating expenses - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Disclosure of other operating expense [line items] |  |
Decrease in local bank taxes | € 62 |
Local bank taxes | 255 | € 192
Netherlands, Germany and Belgium |  |
Disclosure of other operating expense [line items] |  |
Contributions to the Deposit Guarantee Schemes | 157 | 174
Poland |  |
Disclosure of other operating expense [line items] |  |
Contributions to the Local Resolution Fund | € 35 | € 250

X
- 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

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

X
- 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_NetherlandsGermanyAndBelgiumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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