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Equity - Summary of equity (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Share capital and share premium |  |  |  |
Share capital | € 35 | € 37 | € 39 | € 39
Share premium | 17,116 | 17,116 | 17,105 | 17,089
Total share capital and share premium | 17,151 | 17,154 | 17,144 |
Revaluation reserve: Cash flow hedge | (2,058) | (3,055) | (153) |
Revaluation reserves credit liability | 31 | 70 | (80) |
Revaluation reserve: Property in own use | 178 | 176 | 208 |
Net defined benefit asset/liability remeasurement reserve | (317) | (232) | (212) |
Currency translation reserve | (2,527) | (2,395) | (3,483) |
- Share of associates and joint ventures and other | 3,047 | 3,603 | 3,416 |
Treasury shares | 1,994 | 1,205 | 1,612 | 4
Other reserves | (2,767) | (2,192) | (540) |
Retained earnings | 40,299 | 41,538 | 35,462 |
Shareholders’ equity (parent) | 54,684 | 56,500 | 52,066 |
Non-controlling interests | 944 | 504 | 736 |
Total equity | 55,628 | 57,004 | 52,802 | € 52,640
Equity securities |  |  |  |
Share capital and share premium |  |  |  |
Revaluation reserves: financial assets | 1,152 | 1,187 | 1,282 |
Debt securities |  |  |  |
Share capital and share premium |  |  |  |
Revaluation reserves: financial assets | € (280) | € (341) | € 96 |

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