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Customer deposits - Additional information (Details) - EUR (€) € in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of customer deposits [line items] |  |
Current accounts / Overnight deposits | € 225,865 | € 221,773
Savings accounts | 349,910 | 334,296
Time deposits | 113,104 | 92,154
Private Individuals |  |
Disclosure of customer deposits [line items] |  |
Current accounts / Overnight deposits | 106,497 | 107,711
Savings accounts | 322,365 | 305,743
Time deposits | € 50,834 | € 46,762

X
- References No definition available. + Details
Name: | ing_CustomerAccountsOvernightDeposits
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | ing_DisclosureOfCustomerDepositsLineItems
Namespace Prefix: | ing_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Customer accounts credit balances. + References No definition available. + Details
Name: | ing_SavingsAccounts
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Corporate deposits. + References No definition available. + Details
Name: | ing_TimeDeposits
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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