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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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