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Consolidated Companies and Business Acquired and Divested - Additional Information (Detail) - EUR (€) € in Millions			12 Months Ended
	Dec. 13, 2022	Dec. 01, 2021	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Disclosure of Discontinued Operations [line items]
Interest bearing			€ 624,720.0	€ 614,238.0
Impairments			5.0	54.0
Brand, IT and customer relationships
Disclosure of Discontinued Operations [line items]
Impairments				44.0
Intersoftware Holding BV
Disclosure of Discontinued Operations [line items]
Sale of interest	80.00%
Sale of business transaction result	€ 11.0
Profit on sale	7.0
Release of redemption liability	€ 3.0
Payvision
Disclosure of Discontinued Operations [line items]
Impairment loss on deferred tax asset				14.0
Discontinued operations | Czech Retail Banking
Disclosure of Discontinued Operations [line items]
Interest bearing					€ 2,500.0
Government debt instruments held					500.0
Discontinued operations | INGs Retail Banking operations in Austria
Disclosure of Discontinued Operations [line items]
Interest bearing		€ 1,700.0
Mortgages		1,000.0
Other personal lending		400.0
Loans		400.0
Profit (loss) from discontinued operations		€ (26.0)	€ (1.0)
Discontinued operations | Makelaarsland
Disclosure of Discontinued Operations [line items]
Profit (loss) from discontinued operations				€ (3.0)
Discontinued operations | Boursorama
Disclosure of Discontinued Operations [line items]
Interest bearing					€ 9,700.0

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