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Customer deposits - Additional Information (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of customer deposits [line items] |  |
Current accounts / Overnight deposits | € 221,773 | € 260,350
Savings accounts | 334,296 | 329,531
Time deposits | 92,154 | 48,524
Private Individuals |  |
Disclosure of customer deposits [line items] |  |
Current accounts / Overnight deposits | 107,711 | 124,067
Savings accounts | 305,743 | 304,306
Time deposits | € 46,762 | € 16,729

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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: |