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Customer deposits - Additional Information (Details) - EUR (€) € in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of customer deposits [line items]
Current accounts / Overnight deposits	€ 227,827	€ 221,773
Savings accounts	354,560	334,296
Time deposits	107,695	92,154
Private Individuals
Disclosure of customer deposits [line items]
Current accounts / Overnight deposits	107,068	107,711
Savings accounts	324,135	305,743
Time deposits	€ 56,599	€ 46,762

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- Definition

Customer Deposits, Current Accounts And Overnight Deposits

+ References

No definition available.

+ Details

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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

X

- 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: