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Other operating expenses - Additional information (Details) € in Millions	12 Months Ended
	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 EUR (€) bank	Dec. 31, 2021 EUR (€)
Disclosure Of Other Operating Expense [Line Items]
Contributions to the Single Resolution Fund	€ 251	€ 354	€ 308
Decrease in local bank taxes	1
Local bank taxes	472	€ 470	522
Banks party to Institutional Protection Scheme | bank		7
Contributions to Institutional Protection Scheme		€ 99
Netherlands, Germany, Belgium, Poland
Disclosure Of Other Operating Expense [Line Items]
Contributions to the Deposit Guarantee Schemes	€ 320	€ 425	€ 435

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

Contributions To Institutional Protection Scheme

+ References

No definition available.

+ Details

Name:	ing_ContributionsToInstitutionalProtectionScheme
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_ContributionsToSingleResolutionFund
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

- Definition

Number Of Polish Banks Party To The Institutional Protection Scheme

+ References

No definition available.

+ Details

Name:	ing_NumberOfPolishBanksPartyToTheInstitutionalProtectionScheme
Namespace Prefix:	ing_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=ing_NetherlandsGermanyBelgiumPolandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: