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Other operating expenses - Additional information (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Other Operating Expense [Line Items]
Contributions to the Single and Local Resolution Funds	€ 35	€ 251	€ 354
Increase (decrease) in local bank taxes	145
Local bank taxes	617	472	470
Netherlands, Germany, Belgium, Poland
Disclosure Of Other Operating Expense [Line Items]
Contributions to the Deposit Guarantee Schemes	€ 230	€ 320	€ 425

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 Single Resolution Fund.

+ References

No definition available.

+ Details

Name:	ing_ContributionsToSingleAndLocalResolutionFund
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
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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_NetherlandsGermanyBelgiumPolandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: