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Financial assets at fair value through other comprehensive income - Additional information (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financial assets at FVOCI |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Exchange rate differences | € 651 | € 10 |
Disposals and redemptions | 11,913 | 14,526 |
Additions | 19,995 | 18,806 |
Changes in unrealised revaluations | 725 | (3,295) |
Financial assets at FVOCI | Debt securities |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Changes in unrealised revaluations | 657 | (3,230) |
Financial assets at FVOCI | Equity securities |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Exchange rate differences | (100) | (39) |
Disposals and redemptions | 2 | 492 |
Additions | 28 | 17 |
Changes in unrealised revaluations | € 68 | € (65) |
Investment in Bank of Beijing |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Ownership interest held in equity based investments | 13.00% | 13.00% |
Investment in Bank of Beijing | Financial assets at FVOCI |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Exchange rate differences | € (100) | € (39) |
Negative revaluation | € 77 | (49) |
New Investments In Strategic Equity Instruments | Financial assets at FVOCI | Equity securities |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Additions |  |  | € 499
HQLA Eligible Equity Instruments | Financial assets at FVOCI | Equity securities |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Disposals and redemptions |  | € 492 |

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