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Equity - Summary of equity (Details) - EUR (€) € in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Share capital and share premium |  |  |  |
Share capital | € 33 | € 35 |  |
Share premium | 17,116 | 17,116 |  |
Total share capital and share premium | 17,149 | 17,151 |  |
Other reserves |  |  |  |
Reserve of cash flow hedges | (2,264) | (2,058) |  |
Revaluation reserves credit liability | 22 | 31 |  |
Revaluation reserve: Property in own use | 170 | 178 |  |
Net defined benefit asset/liability remeasurement reserve | (300) | (317) |  |
Currency translation reserve | (2,203) | (2,527) |  |
Share of associates and joint ventures and other reserves | 2,750 | 3,047 |  |
Treasury shares | 1,024 | 1,994 |  | € 1,205
Other reserves | (1,542) | (2,767) |  |
Retained earnings | 39,081 | 40,299 |  |
Shareholders’ equity (parent) | 54,689 | 54,684 | € 56,793 |
Non-controlling interests | 816 | 944 |  |
Total equity | 55,505 | 55,628 | € 57,513 | € 57,004
Equity securities at FVOCI |  |  |  |
Other reserves |  |  |  |
Revaluation reserve: equity securities at FVOCI | 1,628 | 1,152 |  |
Revaluation reserve: debt instruments at FVOCI | 1,628 | 1,152 |  |
Debt instruments at FVOCI |  |  |  |
Other reserves |  |  |  |
Revaluation reserve: equity securities at FVOCI | (320) | (280) |  |
Revaluation reserve: debt instruments at FVOCI | € (320) | € (280) |  |

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