The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 130
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_130_g&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph d
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_d_iv&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph e
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_e_iv&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph f
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_f_i&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph d
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_d_ii&doctype=Standard
-URIDate 2025-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph d
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_d_ii&doctype=Standard
-URIDate 2025-03-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph f
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_f_i&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The gain on the disposal of investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 98
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_98_d&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_GainsOnDisposalsOfInvestments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2025-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2025-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2025-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInAssociate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 28
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_e&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2025-01-01
-Paragraph 23
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_g&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 82
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Accumulated Impairment Losses

+ References

No definition available.

+ Details

Name:	ing_AccumulatedImpairmentLosses
Namespace Prefix:	ing_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Disclosure of investments in associates and joint ventures.

+ References

No definition available.

+ Details

Name:	ing_DisclosureOfInvestmentsInAssociatesAndJointVenturesLineItems
Namespace Prefix:	ing_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sensitivity Analysis, Reasonably Possible Change In Risk Variable, Impact On Value In Use

+ References

No definition available.

+ Details

Name:	ing_SensitivityAnalysisReasonablyPossibleChangeInRiskVariableImpactOnValueInUse
Namespace Prefix:	ing_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Sensitivity Analysis, Reasonably Possible Change In Risk Variable, Percent Favorable/(Unfavorable) Change In Cash Flows

+ References

No definition available.

+ Details

Name:	ing_SensitivityAnalysisReasonablyPossibleChangeInRiskVariablePercentFavorableUnfavorableChangeInCashFlows
Namespace Prefix:	ing_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=ing_TMBThanachartBankPublicCompanyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=ing_BelgiumAssociateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ing_AssociatesAndJointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ing_TMBThanachartBankPublicCompanyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ing_IncreaseInCashFlowsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ing_DecreaseInCashFlowsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ing_IncreaseInDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ing_DecreaseInDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ing_IncreaseInTerminalGrowthRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ActuarialAssumptionsAxis=ing_DecreaseInTerminalGrowthRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investment in associates and joint ventures - Additional information (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of investments in associates and joint ventures [line items]
Share of results	€ 209	€ 205	€ 149
Gains on disposals of investments	€ 44
TMBThanachart Bank Public Company Limited
Disclosure of investments in associates and joint ventures [line items]
Percentage of ownership interest	23.00%	23.00%
Share of results	€ 136	€ 123
Accumulated impairment losses	395	395
Belgium Associate
Disclosure of investments in associates and joint ventures [line items]
Share of results	77
Associates and joint ventures
Disclosure of investments in associates and joint ventures [line items]
Share of results	€ 209	€ 205
TMBThanachart Bank Public Company Limited
Disclosure of investments in associates and joint ventures [line items]
Discount rate (cost of equity)	10.17%	10.96%
Terminal growth rate	2.41%	2.74%
TMBThanachart Bank Public Company Limited \| Increase In Cash Flows
Disclosure of investments in associates and joint ventures [line items]
Sensitivity analysis, reasonably possible change in risk variable (in percent)	0.10
Increase (decrease) in value in use	€ 89	€ 57
TMBThanachart Bank Public Company Limited \| Decrease In Cash Flows
Disclosure of investments in associates and joint ventures [line items]
Sensitivity analysis, reasonably possible change in risk variable (in percent)	(0.10)
Increase (decrease) in value in use	€ (90)	(59)
TMBThanachart Bank Public Company Limited \| Increase In Discount Rate
Disclosure of investments in associates and joint ventures [line items]
Sensitivity analysis, reasonably possible change in risk variable (in percent)	(0.01)
Increase (decrease) in value in use	€ 159	95
TMBThanachart Bank Public Company Limited \| Decrease In Discount Rate
Disclosure of investments in associates and joint ventures [line items]
Sensitivity analysis, reasonably possible change in risk variable (in percent)	0.01
Increase (decrease) in value in use	€ (122)	(75)
TMBThanachart Bank Public Company Limited \| Increase In Terminal Growth Rate
Disclosure of investments in associates and joint ventures [line items]
Sensitivity analysis, reasonably possible change in risk variable (in percent)	0.01
Increase (decrease) in value in use	€ 118	68
TMBThanachart Bank Public Company Limited \| Decrease In Terminal Growth Rate
Disclosure of investments in associates and joint ventures [line items]
Sensitivity analysis, reasonably possible change in risk variable (in percent)	(0.01)
Increase (decrease) in value in use	€ (90)	€ (53)
TMBThanachart Bank Public Company Limited \| TMB Public Company Limited
Disclosure of investments in associates and joint ventures [line items]
Percentage of ownership interest	23.00%	23.00%