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Risk management - Management adjustments (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Risk Management [Abstract] |  |
Commercial Real Estate/ Inflation and interest rate increases | € 32 | € 50
Economic sector / portfolio based adjustments | 20 | 38
Mortgage portfolio adjustments | 112 | 112
Climate transition risk | 44 | 29
Other Post Model Adjustments | 29 | (27)
Total management adjustments | € 236 | € 203

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- Definition Climate Transition Risk + References No definition available. + Details
Name: | ing_ClimateTransitionRisk
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Economic Sector Based Adjustments + References No definition available. + Details
Name: | ing_EconomicSectorBasedAdjustments
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Model Time Lag Overlay, Management Adjustments + References No definition available. + Details
Name: | ing_InflationAndInterestRateIncreasesSecondOrderImpactAdjustments
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Management Adjustments + References No definition available. + Details
Name: | ing_ManagementAdjustments
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Mortgage Portfolio Adjustments + References No definition available. + Details
Name: | ing_MortgagePortfolioAdjustments
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other Post Model Adjustments, Management Adjustments + References No definition available. + Details
Name: | ing_OtherPostModelAdjustmentsManagementAdjustments
Namespace Prefix: | ing_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Risk Management [abstract] + References No definition available. + Details
Name: | ing_RiskManagementAbstract
Namespace Prefix: | ing_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration